The conception of “prospective potency” was defined by its author H.Driesch as “the sum of the possible modes of development of a given part of the embryo”. However, in the language of science the word “potency” usually means “power”, not “possibility”. Therefore this conception from the beginning possessed a certain ambiguity, that it retained up to the present. The distinction of “active” and “passive” potency, introduced by Roux, has found no general acceptance. It appeared necessary to submit the conception of (...) “potency” to a profound analysis. In the first place it is shown, that the ambiguity of this conception vanishes, if we understand by the word “potency” those fundamental properties of the embryonic material, that are responsible for its various developmental possibilities. We can distinguish among these properties the “reactive powers”, by which the embryonic material reacts to inductive stimulations, and its own “developmental tendencies”. These faculties only differ by their strength; a “reactive power” may change into a “tendency”, when its intensity increases during development; conversely, a “tendency” may change into a mere “reactive power” by a decrease of its strength. The determination of the material results from the conflict of its tendencies. The inductive actions interfere by strengthening or weakening different tendencies, and by activating new tendencies by reinforcement of the “reactive powers” of the embryonic material. (shrink)

The dominant interpretation ofMetaphysicsΘ.8 commits Aristotle to the claim that the heavenly bodies’ eternal movements are not the exercises of capacities. Against this, I argue that these movements are the result of necessarily exercised capacities. I clarify what it is for a heavenly body to possess a nature and argue that a body’s nature cannot be a final cause unless the natural body possesses capacities that are exercised for the sake of its naturequaform. This discussion yields a better understanding of (...) what capacities are, what explanatory work capacities do, and what it is to possess a nature. (shrink)

The ethical naturalist asks us to take seriously the idea that practical norms are a species of natural norms, such that moral goodness is a kind of natural goodness. The ethical naturalist has not demonstrated, however, how it is possible for a power of reason to be governed by natural norms, because her own attempts to do this have led her into a dilemma. If she takes the first horn and stresses that ethical naturalism provides objective, natural norms of the (...) species, then she fails to show how such norms are practical, or operative from a deliberative point of view. If she takes the second horn and stresses that ethical naturalism yields a picture of knowledge of human life that is practical because it comes through virtuous dispositions of intellect and will, then she fails to have an account of how it is knowledge of facts about a life form, potentially accessible to a non-human knower. In this paper, I argue that one potential resolution to this dilemma can be found in the writings of Thomas Aquinas. On a broadly Thomist account of practical reason, the first principles of practical reason are our common human ends or goods, which are constitutive of a good human life. The work of practical reason on this naturalistic account is twofold: to conceive and order these ends into some general conception of how to live, and to apply this general conception to the particular situations of one’s life in order to realize one’s vision of the good life, here and now. (shrink)

In biology, the “field” concept is used in different ways. Therefore, its meaning in biology as compared to that in physics, and the relation between the conceptions of “gradient” and “field” are studied.In physics, scalar fields, vector fields and tensor fields are distinguished. In a scalar field, the variation of the scalar in space is expressed in form of a gradient. For the whole of a scalar field with its derived gradients the term “gradient-field” may be used.In biology, especially in (...) experimental embryology, the field concept is used both in a purely descriptive sense and as a means of causal analysis. To the first group belong the kinematic fields and growth fields. The kinematic field is a vector field; the growth field is generally a tensor field, but may be treated as a gradient-field in the most simple cases. In the causal analysis of development the gradient-field plays an important part, in the form of axial, superficial and spatial gradient-fields. In such a field by the combined action of the scalar and the gradients a great diversity of relations may occur. Probably, both the induction field and the organisation field belong to the class of gradient-fields. (shrink)

It is rarely, if at all, thought that Socrates committed suicide; but such was the case, or so I want to suggest. My suggestion turns not upon any new interpretation of ancient sources but rather upon seeking a determination of the concept of suicide itself.

A premise of Corballis's theory is that speech arose when vocalization co-opted existing gestural functions in the left ventral premotor cortex. Yet, visuomotor functions in this region remain largely unchanged between humans and macaques and have no discernible connection to gestural communication. This functional continuity suggests that language production is not the result of modifying existing motor functions in this region.

Glover suggests that representational systems for planning versus control are mapped exclusively to the inferior (IPL) versus superior (SPL) parietal lobules respectively. Yet, there is ample evidence that the IPL and SPL both contribute to action planning and control. Alternatively, I distinguish between the parietal-frontal systems involved in the representation of acquired manual skills versus nonskilled actions.

The paper explores the severity of the problem of soil erosion and a variety of approaches to the problem. The typology of approaches includes doing nothing, individual party litigation, the state's invocation of public trust doctrine, and the state's exercise of its police power. The Reinvest in Minnesota Program reflects the state's exercise of its police power and addresses the problem of soil erosion by retiring marginal land from crop production through conservation easements. Programs such as Reinvest in Minnesota also (...) reflect a certain ethic about the land. (shrink)

The most common view of suicide today is that it is intentional self-killing. 1 Because of the self-killing component, suicide is often described as self-inflicted death or as dying by one's own hand, and the victim is in turn often described as having done himself to death or as having taken his own life. But must one's death be self-inflicted in order to be suicide? The answer, I want to suggest, is arguably no.

A SUMMARY IN ENGLISH [by Editor]The problem is to find out whether mathematical propositions are analytical, and if so, or if not, to what extent.Kant defined the analyticity in terms of Cartesian res extensa, exemplified by “A body is extended”, while he considered, because of such examples, mathematical propositions to be synthetic. The recent studies in set theory by Gödel, P.J.Cohen, etc., indicate, however, that such a proposition as the continuum hypothesis is certainly not “analytic (tautological)” in the strict sense (...) of logicists. Rather a small portion, comparatively speaking, of mathematical propositions must therefore be considered analytic relative to the definitions of fundamental conrepts in logic. Axioms, for example, are per definitionem non-analytic. Other problems that demand reöxaminations are, for instance: 1. Why is there only one unique series of the natural numbers? 2. On which ground is the factual eminence of Euclidean geometry to be founded? etc. The two assertions that mathematical propositions are analytic and that they are synthetic a priori are thus not at all contradictory; they are, to begin with, not even mutually exclusive Possibilities. (shrink)

Der Band fragt nach der Rolle des Körpers im Recht. Vertreter:innen der Philosophie, Theologie und Rechtswissenschaft untersuchen ein vielseitiges und komplexes Spektrum an Fragen, die sich aus dem Verhältnis der Begriffe „Recht" und „Körper" ergeben. In welcher rechtlichen Gestalt tritt ein (menschliches) Rechtssubjekt als Körper auf? Wie wird seine Körperlichkeit vom Recht erfasst, geschützt und normativ bestimmt und gestaltet? Was unterscheidet aus einer rechtlichen Perspektive den menschlichen vom tierischen Körper? Kann der menschliche Körper als Eigentum verstanden werden oder gehorcht er (...) einer fundamental anderen Logik? (shrink)

Distortions in memory impose important bounds on rationality but have been largely disregarded in economics. While it is possible to learn, it is more difficult, and sometimes impossible, to unlearn. This retention effect lowers individual utility directly or via reduced productivity, and adds costs to principal-agent relationships. The engraving effect states that the more one tries to forget a piece of information the more vivid it stays in memory, leading to a paradoxical outcome. The effects are based on, and are (...) supported by, psychological experiments, and it is shown that they are relevant in many economic situations and beyond. (shrink)

Pain alone does not settle the issue of vivisectionIn his paper, Lab animals and the art of empathy, David Thomas presents his case against animal experimentation. That case is a rather unusual one in certain respects. It turns upon the fact that, for Thomas, nothing can be proved or established in ethics, with the result that what we are left to operate with, apart from assumptions about cases that we might choose to make, are people’s feelings. We cannot show or (...) demonstrate that Pol Pot did anything morally wrong; we just have to hope, as seems not unreasonably demanding, that most people feel pretty strongly about large scale slaughter of human beings. Since nothing can be proven, we turn instead to our feelings and the three claims that Thomas features in his paper: that we should empathise with all creatures who can feel pain and suffer; that we should be consistent in condemning things based upon a similar degree of suffering involved and so treat like cases alike, and that we should take consent seriously, and, where the possibility of consent is absent, take seriously the notion of the best interests of the creature involved. Thomas concludes his paper with a succinct statement of his position: “In other words, we should look at things from the perspective of the victim, human or animal, not that of the would be exploiter. By this yardstick, animal experiments are as immoral as non-consensual experiments on people. In each case, the degree of immorality is in direct proportion to the degree of suffering caused—experiments causing severe suffering are more immoral than those causing only mild, transient suffering. Crucially, however, an experiment causing severe suffering to an animal is as immoral as one causing severe suffering to a person.”All animal experiments, therefore, have …. (shrink)

Online science and engineering ethics (SEE) education can support appropriate goals for SEE and the highly interactive pedagogy that attains those goals. Recent work in moral psychology suggests pedagogical goals for SEE education that are surprisingly similar to goals enunciated by several panels in SEE. Classroom-based interactive study of SEE cases is a suitable method to achieve these goals. Well-designed cases, with appropriate goals and structure can be easily adapted to courses that have online components. It is less clear that (...) exclusively online methods can support the wide range of goals necessary to good moral pedagogy in SEE, though there seems no a priori reason to rule this out. Only careful, goal-based assessment of online case study SEE teaching can resolve this question. (shrink)

The moral issues involved in doctors assisting patients to die with dignity are of absolutely central concern to the medical profession, ethicists, and the public at large. The debate is fuelled by cases that extend far beyond passive euthanasia to the active consideration of killing by physicians. The need for a sophisticated but lucid exposition of the two sides of the argument is now urgent. This book supplies that need. Two prominent philosophers, Gerald Dworkin and R. G. Frey present (...) the case for legalization of physician-assisted suicide. One of the best-known ethicists in the US, Sissela Bok, argues the case against. (shrink)

According to Carnap an account of the nature of mathematics, both pure and applied, must include the thesis that mathematical truths are devoid of factual content. He first formulated this thesis around 1930 and in its defence attempted to combine the reduction of mathematics to logic undertaken in the Principia with Wittgenstein’s insights into the nature of logic. In this paper I will show that this synthesis faces serious difficulties. Thus, it plays, with good reason, no longer a role in (...) Carnap’s mature philosophy of mathematics. (shrink)