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In lieu of an abstract, here is a brief excerpt of the content:BOOK REVIEWS 265 concluding chapter (pp. 150-52), Dr. Clair deals with "Comment lire l'oeuvre du P. Thomassin," providing much guidance to anyone who wishes to avail himself of the rich resources in Thomassin's writings. From the point of view of the history of philosophy, the most interesting aspects of Thomassin's thought seem to be (1) his "Cartesianism," that is, the extent to which he early imbibed Descartes' new ideas, and played a role in the fusion of the views of Augustine, B6rulle, and Descartes that developed in the Oratory, (2) his attempt to find a viable theory of the nature of Grace somewhere between Arnauld and Malebranche, and (3) his efforts to formulate a philosophy of history within an Augustinian theology; a philosophy of history that would make historical research and understanding of genuine philosophical and religious value to man. Dr. Clair's too brief discussions indicate that Thomassin was definitely influenced by reading Descartes, but also that Thomassin was much too eclectic to be a Cartesian. With regard to the problem of Grace, where the Cartesian Arnauld fought with the semi-Cartesian Malebranche, Thomassin tried deftly to maintain an Augustinian position that was not quite as rigid as that of the Jansenists, nor as moderate as that of Malebranche (though Arnauld tried to use Thomassin's erudition and authority in his battles with Malebranche). Unfortunately Dr. Clair does not try to evaluate whether Thomassin really found a coherent and theologically acceptable middle-ground between the two antagonists. On the subject of the philosophy of history, Thomassin's views seem most interesting (at least to this reviewer). The short text that Dr. Clair includes on the difference of history from science reveals Thomassin trying to show that the investigation and comprehension of temporal particulars can have significant value for man's understanding of man and that there can be genuine certainty about past facts. Thomassin was writing in the period when modern historical method and outlook were born, when historical study changed from chronicles and ammunition in theological and political disputes to a basic way of understanding human nature. Those concerned with the role of Bayle, Hume, Gibbon, and Vico in developing an historical methodology and a rationale for art historical approach to human problems might well profit from considering Thomassin's writings in this area, and the influence they had on modern historiography and philosophies of history. Dr. Clair's short work certainly helps in filling a lacuna in our picture of the seventeenth century. It also makes one wish he had done more, and had provided a "complete" study of Thomassin's thought and influence. That, perhaps, is one of the major purposes of this new series, in that it will lead scholars to looking into the more hidden portions of the period, and will lead them to filling out in more detail and depth the history of the rise and fall of modern philosophy. It is to be hoped that future volumes in this series will continue to whet our appetites for further investigations, and will transform more of the names we run across into figures about whom we have some information and from whom we can still learn something. RICHARD H. POPKIN University of California, San Diego Berkeley's Theory of Vision..4 Critical Examination of Bishop Berkeley's Essay towards a New Theory of Vision. By D. M. Armstrong. (Melbourne: University Press; London and N. Y.: Cambridge University Press, 1960. Pp. viii + 106. $4.50). Berkeley's brilliant though disconcerting Essay has been rather neglected for some time, except for the able studies of C. M. Turbayne of Rochester University (N. Y.). Armstrong's book is welcome for that reason, also for its freshness, clearness, and rich brevity. A1- 266 HISTORY OF PHILOSOPHY though a slim volume, it is packed with close yet lucid argumentation, conducted throughout with good manners, and throughout exploratory, clarifying problems, exposing logical and empirical difficulties, not grandly telling us what the truth is but leaving us in a better position to carry on the exploration ourselves. It is an exemplary piece of philosophical discussion. He clears his ground by noting that the Essay, so far as...