Plato: Natural Science

In this paper I examine the role of optimality reasoning in Aristotle’s natural science. By “optimality reasoning” I mean reasoning that appeals to some conception of “what is best” in order to explain why things are the way they are. We are first introduced to this pattern of reasoning in the famous passage at Phaedo 97b8-98a2, where (Plato’s) Socrates invokes “what is best” as a cause (aitia) of things in nature. This passage can be seen as the intellectual ancestor of (...) Aristotle’s own principle, expressed by the famous dictum “nature does nothing in vain but always what is best for the substance from among the possibilities concerning each kind of animal” (Progression of Animals II, 704b12-18). The paper is focused around exploring three questions that arise in connection with Aristotle’s use of this optimality principle: (1) How do we understand the concept of “the best” at work in the principle? (2) How does Aristotle conceive of “the range of possibilities”? And, finally, (3) what role does optimality reasoning play in Aristotle’s natural science? Is it a special form of demonstration in which the optimality principle functions as one of its premises, or is it a heuristic device that helps uncover those causally relevant features of a natural substances that ultimately serve as middle terms in demonstrations? In the final section I return to the comparison between Plato and Aristotle and argue that, while both see the natural world as the product of an optimizing agent and while both see this assumption as licensing a pattern of reasoning that appeals to a certain conception of “the best”, they disagree fundamentally over what the optimization agent is and how it operates. Thus, despite their general agreement, it would be a mistake to think that Aristotle simply took over Plato’s use of optimality reasoning without significant modifications. (shrink)

L'étude entend montrer que, si le temps est finalement unique, l'espace, lui, est originellement (et non du fait de la constitution de l'être-au-monde) multiple. Une analyse d'un passage du Timée où la Chôra est dite tithênê (nourrice) permet d'asseoir une interprétation de la différence foncière entre espace et lieu. Le lieu a progressivement disparu pour s'absorber dans l'espace neutre qui traduit homologiquement l'infinité divine ou pour s'atténuer dans le site. Il est difficile de trouver une analyse adéquate du lieu depuis (...) la mort de Leibniz (1916) jusqu'à la thèse de Bergson en latin sur la notion aristotélicienne de lieu. This study aims at making clear that, if, on the one hand, time is finally unique, while, on the other hand, we can say that space is in itself, and not for transcendantal reasons (the constitution of human subjectivity), a many-fold entity. By considering with great accuracy Plato's Timæus, where topos as chôra appears as tithênê (a nurse), we are able to interpret the very real distinction between space and place. Place has progressively disappeared, being absorbed in this homology of God's infinite, which is indeed Newton's neutral space, or at least being weakened in « site » (Ort). We will hardly find, between Leibniz' death and Bergson's latin thesis on aristotelician conception of topos, one correct study about place. (shrink)

The intellectual history of evolutionary theory really does not begin in earnest until the late seventeenth/early eighteenth century. Prior to that, the idea that species might have evolved over time was not a serious possibility for most naturalists and philosophers. There is certainly no substantive debate in antiquity about evolution in the modern sense. There were really only two competing explanations for how living things came to have the parts they do: design or blind chance. Ancient Greek Atomism, for example, (...) taught that all composite bodies, including living things, are generated through the random collision of atoms as they rebel and move in the void. Plato and Aristotle both dismissed this possibility on the grounds that living things are too complex and too well-adapted to be products of chance. This eventually became the central premise in Galen’s own Argument from Design. That species forms might have gradually evolved over time by a process of natural selection was not seen as a plausible alternative. Of course, such a theory had been proposed by Empedocles in the fifth century BCE. But because his theory still relied heavily on chance, it was not taken seriously by any of the later ancient Greek or Roman thinkers. My aim in this paper is to investigate the reasons why evolutionary thinking failed to gain momentum in antiquity after its introduction by Empedocles. (shrink)

This paper is about the history of a question in ancient Greek philosophy and medicine: what holds the parts of a whole together? The idea that there is a single cause responsible for cohesion is usually associated with the Stoics. They refer to it as the synectic cause (αἴτιον συνεκτικόν), a term variously translated as ‘cohesive cause,’ ‘containing cause’ or ‘sustaining cause.’ The Stoics, however, are neither the first nor the only thinkers to raise this question or to propose a (...) single answer. Many earlier thinkers offer their own candidates for what actively binds parts together, with differing implications not only for why we are wholes rather than heaps, but also why our bodies inevitably become diseased and fall apart. This paper assembles, up to the time of the Stoics, one part of the history of such a cause: what is called ‘the synechon’ (τὸ συνέχον) – that which holds things together. Starting with our earliest evidence from Anaximenes (sixth century BCE), the paper looks at different candidates and especially the models and metaphors for thinking about causes of cohesion which were proposed by different philosophers and doctors including Empedocles, early Greek doctors, Diogenes of Apollonia, Plato and Aristotle. My goal is to explore why these candidates and models were proposed and how later philosophical objections to them led to changes in how causes of cohesion were understood. (shrink)

Whatever our metaphysics of time, today we usually work with the assumption that we have one unified temporal framework, which allows for situating all events, processes, and happenings in the sense that we can put them all in a temporal relation to each other; they are all either before, after, or simultaneous with each other. In this paper, I show that for the early Greeks, by contrast, the very idea of such a unified notion of time would be foreign; instead, (...) they assume different temporal (and not necessarily comparable) struc-tures belonging to different events. And I show what effect this lack has on the quality of temporal experiences – it means that different temporal experiences are thus seen as expe-riences of genuinely different kinds. (shrink)

Plutarch is committed to geometric atomism, the Platonic theory that derives the material elements from regular polyhedric shapes. An essential feature of this theory is that qualitative properties are not primitive, but supervene on more fundamental, quantitatively describable properties, such as the size, shape, mass or weight of the atoms, their solidity, position, arrangement and kinetic interactions. Plutarch recognises that the geometric account provides the causal explanation for phenomenal and other qualitative properties. He praises Plato and Democritus for their theoretical (...) accomplishment in this domain. Yet in his reply to Colotes, he criticises Epicurus and Democritus because of their atomism, and claims that it is not possible to derive qualities from qualityless atoms. Plato’s theory is different, he claims, as it does not make the primordial corpuscles qualityless and unchanging. I examine three possible explanations for this discrepancy: Plutarch’s argument against Democritus serves purely polemical purposes; Plutarch is not fully aware of the theoretical force and import of geometric atomism; he disposes of a more sophisticated account of geometric atomism, containing assumptions unknown to us that save the model from the objections directed at Democritus. (shrink)

In the Timaeus, Plato makes a distinction between reason and necessity. This distinction is often accounted for as a distinction between two types of causation: purpose oriented causation and mechanistic causation. While reason is associated with the soul and taken to bring about its effects with the good and the beautiful as the end, necessity is understood in terms of a set of natural laws pertaining to material things. In this paper I shall suggest that there are reasons to reconsider (...) the latter part of this account and argue for a non-mechanistic understanding of necessity. I will first outline how the notion of necessity is introduced in the dialogue. I will then show how a mechanistic account of necessity fails to capture Plato’s purpose of treating it as a causal factor; and, finally, argue that this purpose is better understood as an attempt, on Plato’s part, to account for the causal origin of disorder and irrationality, an origin articulated in terms of a pre-cosmic situation and the notoriously difficult notion of the third kind. (shrink)

The article aims at demonstrating that in attributing the creatio ex nihilo to both Plato and Aristotle as their unanimous philosophical conviction the Treatise on the Harmony between the Two Sages deeply depends upon the Neoplatonic reading of those two philosophers. The main obstacles for such a view in the works of the two sages are Plato's assumption of a precosmic chaos in the Timaeus and Aristotle's denial of any efficient causality to the unmoved mover in the Metaphysics. Both of (...) these points had been, however, done away with by the Neoplatonist commentators already, especially by Ammonius in his lost treatise on efficient and final causality in Aristotle the use of which in the Harmony is shown by a comparison with Simplicius. Christian and Muslim readers just had to transfer those arguments and hermeneutical techniques into an anti-eternalist context in order to make the two philosophers agree with one of the basic tenents of their face, a hermeneutical technique considerably different from the one employed by al-Fārābī in his exposition of Plato's and Aristotle's philosophy which is compared to the Harmony in a briefly sketched concluding section.L'article vise à montrer que le Traité sur l'harmonie des deux sages, en attribuant la creatio ex nihilo à Platon et Aristote comme conviction philosophique commune, dépend profondément de la lecture néoplatonicienne de ces deux philosophes. Les obstacles principaux à une telle attribution dans les œuvres des deux sages sont, dans le Timée de Platon, l'affirmation d'un chaos précosmique et, dans la Métaphysique d'Aristote, la négation d'une causalité efficiente du premier moteur immobile. L'interprétation néoplatonicienne avait toutefois éliminé chacune de ces affirmations de la doctrine des deux maîtres, comme le montre en particulier le traité d'Ammonius sur la causalité finale et efficiente chez Aristote. Or, on peut montrer, par une comparaison avec Simplicius, que l’Harmonie faisait usage de ce traité. Les philosophes chrétiens et musulmans avaient ainsi la possibilité d'employer les mêmes arguments et méthodes herméneutiques pour établir une concordance entre les deux principales autorités philosophiques d'une part et une de leurs plus importantes convictions religieuses d'autre part – une herméneutique qui diffère considérablement de la méthode appliquée par al-Fārābī dans sa propre exposition des philosophies de Platon et d'Aristote, comme le montre, dans la conclusion de l'article, la brève comparaison avec l’Harmonie.Send article to KindleTo send this article to your Kindle, first ensure [email protected] is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle. Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply. Find out more about the Kindle Personal Document Service.CREATIO EX NIHILO – A GENUINELY PHILOSOPHICAL INSIGHT DERIVED FROM PLATO AND ARISTOTLE? SOME NOTES ON THE TREATISE ON THE HARMONY BETWEEN THE TWO SAGESVolume 22, Issue 1Benjamin Gleede DOI: https://doi.org/10.1017/S0957423911000117Your Kindle email address Please provide your Kindle [email protected]@kindle.com Available formats PDF Please select a format to send. By using this service, you agree that you will only keep articles for personal use, and will not openly distribute them via Dropbox, Google Drive or other file sharing services. Please confirm that you accept the terms of use. Cancel Send ×Send article to Dropbox To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about sending content to Dropbox. CREATIO EX NIHILO – A GENUINELY PHILOSOPHICAL INSIGHT DERIVED FROM PLATO AND ARISTOTLE? SOME NOTES ON THE TREATISE ON THE HARMONY BETWEEN THE TWO SAGESVolume 22, Issue 1Benjamin Gleede DOI: https://doi.org/10.1017/S0957423911000117Available formats PDF Please select a format to send. By using this service, you agree that you will only keep articles for personal use, and will not openly distribute them via Dropbox, Google Drive or other file sharing services. Please confirm that you accept the terms of use. Cancel Send ×Send article to Google Drive To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about sending content to Google Drive. CREATIO EX NIHILO – A GENUINELY PHILOSOPHICAL INSIGHT DERIVED FROM PLATO AND ARISTOTLE? SOME NOTES ON THE TREATISE ON THE HARMONY BETWEEN THE TWO SAGESVolume 22, Issue 1Benjamin Gleede DOI: https://doi.org/10.1017/S0957423911000117Available formats PDF Please select a format to send. By using this service, you agree that you will only keep articles for personal use, and will not openly distribute them via Dropbox, Google Drive or other file sharing services. Please confirm that you accept the terms of use. Cancel Send ×Export citation Request permission. (shrink)

I offer a comparison between Plato’s discussion of χώρα in the Timaeus at 48A–53C and Aristotle’s discussion of τόπος in Physics Book IV, arguing that the two accounts have more in common than has been suggested by Continental scholars. Τόπος and χώρα both signal what I call the impasse of place as the question of that which cannot be reduced to either the sensible or the intelligible, and which grounds such categories. Identifying this impasse reveals Plato’s and Aristotle’s accounts of (...) “place” as strikingly dissimilar from the Newtonian category of Absolute Space; and it also suggests new ways of thinking the relationships between bodies, motion, place and nature. (shrink)

The author emphasizes the fact that the largest part of Plato’s Timaeus deals with human nature and offers a detailed account of the constitution of the human body. He then lists the parallels and the differences between the constitution of the world body and the human body. The central part of the paper deals with Plato’s explanation of the persistence of the human body within a bodily environment which causes its dissolution. The author pays a special attention to Plato’s theory (...) of the apparatus which keeps running the processes of respiration, digestion and blood circulation. In the concluding section, the author raises thequestion of the relationship between human body and human soul. He shows that, in Plato’s Timaeus, the human body functions to a large extent independently from human soul. One possible reason for this theory is Plato’s conception of the immortal soul. While the human body exists in order to harbour the immortal soul, the latter does not produce and preserve it nor does it cause its dissolution. It only exercises cognitive and ruling functions in it as long as the body is able to hold together and to detain the soul. (shrink)

This paper aims to show that—and how—Plato’s notion of the receptacle in the Timaeus provides the conditions for developing a mathematical as well as a physical space without itself being space. In response to the debate whether Plato’s receptacle is a conception of space or of matter, I suggest employing criteria from topology and the theory of metric spaces as the most basic ones available. I show that the receptacle fulfils its main task–allowing the elements qua images of the Forms (...) to exist as sensible things by being that in which the elements appear, change and move–in virtue of being pure continuity. All further qualifications required for a full notion of space are derived solely from the content of the receptacle. (shrink)

Plato's Timaeus is one of the most influential and challenging works of ancient philosophy to have come down to us. Sarah Broadie's rich and compelling study proposes new interpretations of major elements of the Timaeus, including the separate Demiurge, the cosmic 'beginning', the 'second mixing', the Receptacle and the Atlantis story. Broadie shows how Plato deploys the mythic themes of the Timaeus to convey fundamental philosophical insights and examines the profoundly differing methods of interpretation which have been brought to bear (...) on the work. Her book is for everyone interested in Ancient Greek philosophy, cosmology and mythology, whether classicists, philosophers, historians of ideas or historians of science. It offers new findings to scholars familiar with the material, but it is also a clear and reliable resource for anyone coming to it for the first time. (shrink)

One aim of this paper is to bring to the surface the problems with the traditional, non-literal interpretation of the pre-cosmos in the Timaeus. Contrary to this traditional interpretation, I show that Necessity is an ateleological cause capable of bringing about the events in the pre-cosmos, and that Intelligence is a teleological cause that produces effects only for the sake of maximizing the good. I conclude that there are no grounds for supposing that Intelligence is a causal force operating in (...) the pre-cosmos, and that the account of the pre-cosmos should be taken literally: it is an account of the works of Necessity alone. (shrink)

The architectonic principle, as stated in Aristotle's Politics, is related to the arrangement of the arts, the technai, whereby it is argued that the leading art is the politike techne. Plato, in the Gorgias, has argued for an architectonic of crafts. Four technai provide the best, aei pros to beltiston therapeuousai, and they differ from the pseudo-crafts that offer pleasure while indifferent to the beltiston. The principle for arranging the architectonic is the pursuit of the best, whereby each practitioner of (...) a craft is expected to give logos concerning the "how" as well as the end of the craft. Extending the Platonic principle, Aristotle brings together under a unified theory the intelligibility of nature and human nature in line with the ends of episteme and techne, especially the politike techne. (shrink)

This paper develops a structural parallel between the maternal/feminine body in Greek mythology and the figure of the body in Plato’s Timaeus. HistoricallyPlato is often portrayed as a thinker who is concerned with the corporeal only insofar as philosophy is engaged in transcending bodily limitations. Yet the Timaeus is not engaged in producing a dualistic opposition between the intelligible and the sensible, nor is Platonic philosophy a rejection of life in favor of the perfect wisdom that comes with death. The (...) following work will suggest that the Timaeus is a dialogue deeply concerned with the question of birth and corporeality and that this concern is disclosed in and through Timaeus’s evocation of the body. (shrink)

A Critical Notice of Thomas KjellerJohansen, Plato’s Natural Philosophy. A Study of the Timaeus-Critias.

In the _Phaedo Socrates says that as a young man he thought it a great thing to know the causes of things; but finding existing accounts unsatisfying, he fell back on a method of his own, hypothesizing that Forms are causes. I argue that part of what this hypothesis says is that certain phenomena--the ones for which it postulates Forms as causes--are the result of processes whose object was to produce them. I then use this conclusion to explain how Socrates' (...) discussion of causality in the _Phaedo might be supposed to contribute to his final argument for immortality. (shrink)

Dans le Timée, l'hypothèse de la khó̱ra, qu'il faut se garder d'identifier avec la húle̱ aristotélicienne, permet de rendre compte du fait que les choses sensibles sont radicalement différentes de leur modèle intelligible. Or, la constitution mathématique des éléments à partir de la khó̱ra mène à la contradiction suivante : dans l'univers platonicien, il faut tenir compte à la fois du continu qui doit caractériser la khó̱ra, et du discontinu qu'instaurent inéluctablement les polyèdres réguliers auxquels sont associés les éléments. La (...) physique platonicienne n'est donc ni un atomisme, comme celui proposé par Leucippe et Démocrite, ni une physique du continu, comme celle admise par Parménide et Zénon. In the Timaeus, the hypothesis of khó̱ra, which we must refrain from identifying with Aristotelian húle̱, enables us to account for the fact that sensible things are radically different from their intelligible model. Yet the mathematical constitution of the elements from khó̱ra leads to the following contradiction : in the Platonic universe, we must take into account both the continuity that must characterize khó̱ra and the discontinuity inevitably introduced by the regular polyhedra with which the elements are associated. Platonic physics is thus neither an atomism, like that proposed by Leucippus and Democritus, nor a physics of continuity, like that held by Parmenides and Zeno. (shrink)

This article explores how Plato, in his “metaphysical” dialogues, sees the specific properties of motion , which lend themselves to adaptation for the purposes of maintaining or restoring the health of the soul. Plato explores the property of regular or rhythmic motion in particular. The attention has been drawn to the analogy between the calming effect of music, at the human level, and the Demiurge’s achievement in willing the world into existence. The focus of the article lays on the Laws, (...) in which the principle of musical motion plays a central role in resolution of the contradictions between material and spiritual, natural and physiological, medical and educative.U članku se istražuje kako Platon u svojim “metafizičkim” dijalozima vidi specifična svojstava kretanja koja su prikladna za prilagodbu u svrhu očuvanja ili uspostavljanja zdravlja duše. Platon posebno istražuje svojstvo pravilnog ili ritmičkog kretanja. Naglašava se analogija između umirujućeg učinka glazbe, na ljudskoj razini, i Demiurgova stvaranja svijeta. U žarištu članka su Zakoni u kojima načelo glazbenog kretanja igra ključnu ulogu u rješavanju proturječnosti između materijalnog i duhovnog, prirodnog i psihološkog, medicinskog i obrazovnog. (shrink)

In this paper, I set out to refute several charges that have recently been raised against Plato’s attitude toward the environment and to present him under a new light of relevance for the contemporary environmental debate. For this purpose, I assess the meaning of Plato’s metaphysical dualism, his notion of nature and teleology, and the kind of value that he attributes to animals, plants, and the land in general. I thus show how Plato’s organicist view of the universe endows it (...) with an intrinsic value that is over and above each of its parts, including humans, and provides an argument for the preservation of species of nonhuman animals, which in many relevant ways are not ranked below the human species. In addition, I show how Plato’s dialogues provide good evidence for human concern about the environment and how such a concern is promoted rather than hindered by his nonanthropocentric notion of teleology. (shrink)

This is a response to Val Plumwood's critique of Plato and an overview of the way in which Plato provides a viable environmental vision. This vision sees the realm of nature as rooted in the realm of logos, and human beings as sojourners who are nonetheless integral parts of nature and whose vocation is to act as mediators between the two realms thereby bringing nature into even greater participation in logos. To fulfill the human vocation, one must come to an (...) awareness of the logos by purging oneself of the sham values which permeate society and distort one's understanding of reality. (shrink)

Plato's comments on astronomy and the education of the guardians at Republic 528e ff have been hotly disputed, and have provoked much criticism from those who have interpreted them as a rejection or denigration of observational astronomy. Here I argue that the key to interpreting these comments lies in the relationship between the conception of enquiry that is implicit in the epistemological allegories, and the programme for the education of the guardians that Plato subsequently proposes. We have, I suggest, been (...) too eager to stress the similarities here, when recognition of the differences may supply us with the tools required for a better understanding of 528e ff, one that to a large extent disarms the anti-empirical critique. My discussion proceeds in three stages. Firstly, Plato takes great care to place his comments on astronomy in the context of the preceding epistemological allegories. Is there any evidence here, where Plato might be thought to discuss enquiry in general, that he rejected or denigrated observation? I argue that even if Plato advocated a 'Two Worlds' (TW) ontology, he still envisaged a dynamic process of enquiry, interrelating sensibles and intelligibles, the investigation of each being necessary but not sufficient to achieve the overall aim. Secondly, Plato appears to be deriving how we ought to go about educating the guardians from how we ought to conduct our enquiries. While the two are intimately related there are important differences, recognition of which turns the supposed rejection of observation into an affirmation of the need for an initial empirical approach. I contend that this makes good sense of the internal structure of 528e ff, and of its relations to other parts of the Republic. Thirdly, I discuss the Republic in relation to the evidence offered by later works on the question of astronomy and observation, and raise the question of whether Plato's views on the imperfection of the sensible world necessarily lead to the denigration of careful and prolonged empirical work. (shrink)

Some biologists and philosophers of biology have seen in Plato an especially objectionable version of essentialism or topology. Although kinds of animals are mentioned in almost all of Plato's dialogues, in none of them is there an explicity stated doctrine of animal kinds. An examination of the dialogues has, moreover, failed to reveal some implicit but consistent and unambiguous view of kinds that Plato might have held.