Cicero's philosophical works are now exciting renewed interest, in part because he provides vital evidence of the views of the Greek philosophers of the Hellenistic age, and partly because of the light he casts on the intellectual life of first century Rome. This edition uses the 1997 Clarendon text by the acclaimed translator P.G. Walsh.

It is well known that Kant was stirred from his "dogmatic slumber" by the writings of David Hume. It is not well known that Hume had a similar effect upon his contemporary Thomas Reid. Yet it was Hume who led Reid to see that the path along which British Empiricism was moving might well end in Pyrrhonian skepticism-Hume's denial to the contrary. Interest in the writings of Reid has been increasing in recent years. One reason is that the range of (...) Reid's philosophical inquiry covers a number of areas which attract a good deal of attention today. Reid offers interesting and often significant insights into aspects of epistemology, philosophy of mind, aesthetics, and philosophy of action. His philosophy has contributed to the writings of such men as G. E. Moore, C. S. Peirce, R. Chisholm, P. Winch, to mention only a few. This new edition of An Inquiry Into the Human Mind follows closely upon the heels of new editions of Reid's Essays on the Active Powers of Man and Essays on the Intellectual Powers of Man, both of which appeared in 1969. In introducing this latest edition, Duggan chose to concentrate his attention upon one aspect of Reid's thought rather than offer a rapid and perhaps superficial treatment of the multifaceted thinking of this 18th century philosopher. Duggan's critical analysis of Reid's interpretation of sensation and perception is invaluable for introducing the reader to Reid's philosophical alternative to Hume. It was this alternative which came to be known as the philosophy of common sense.--W. P. G. (shrink)

Macquarrie is thorough in his coverage of the subject matter, precise in the exposition of his thought, and creative in his attempt to explicate the principles upon which a Christian theology for the twentieth century can be based. In Twentieth Century Religious Thought, Macquarrie concluded that religion and philosophy need each other. There he claimed that from the philosophical side attention should be paid to Martin Heidegger, and from the religious side one should look at Bultmann and Tillich. Macquarrie has (...) done just this in Principles of Christian Theology. This book is divided into three main parts: philosophical theology, symbolic theology, and applied theology. Although there is much of significance in the last two sections, it is in the first one that the author makes his distinctive contribution to theology. His approach is phenomenological. This leads him to an existential interpretation of theology. What he arrived at by means of this approach he called "Existential-Ontological Theism." Although there are some theologians who may have a few doubts as to whether or not Macquarrie has reached his conclusions by stretching some fundamental interpretations too far, it still remains a certainty that this book opens up a new and creative approach to some of the traditional concepts of theology which have been under so much fire in the last few decades.—W. P. G. (shrink)

In its original form Dirac's equations have been expressed by use of the γ-matrices γμ, μ=0, 1, 2, 3. They are elements of the matrix algebra M 4 (ℂ). As emphasized by Hestenes several times, the γ-matrices are merely a (faithful) matrix representation of an orthonormal basis of the orthogonal spaceℝ 1,3, generating the real Clifford algebra Cl 1,3 . This orthonormal basis is also denoted by γμ, μ=0, 1, 2, 3. The use of the matrix algebra M 4 (ℂ) (...) to represent Cl 1,3 has some unsatisfactory aspects. The γ-matrices contain imaginary numbers as entries whereas Cl 1,3 is real. Moreover, as a matrix algebra Cl 1,3 is M 2 (ℍ) but only a part of M 4 (ℂ). For that reason we investigate in this paper several forms of Dirac's equations in terms of M 2 (ℍ) instead of M 4 (ℂ). In Section1 we survey Dirac's equations describing the interaction of matter with electromagnetic, electroweak, and strong fields. Section2 deals with electromagnetic/weak interactions employing M 2 (ℍ). Finally, in Section3 we deal with Dirac's equations for strong interactions between quarks. In contrast to su(2) ⊕ u(1), the Lie algebra su(3) is not isomorphic to any subalgebra of Cl 1,3 . Therefore we do not give a description of strong interactions by use of M 2 (ℍ). Instead of such an approach we describe these interactions using the space of quadruples of bivector fields in Cl 1,3 . The thus obtained description has remarkable formal resemblance to the original Dirac equations using wave functions with values in the linear spaceℂ 4. (shrink)