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 L. T. HOBHOUSE, Mind in Evolution. 103 the recognition of differences, and objects to Hegel's calling his method dialectical, because that method involves the recognition of identity as well. Dr. Baillie is true to Hegel's thought ; he is not true here to Hegel's terminology. The Notes on " Contradiction " and " Development," appended to this chapter, are very clever pieces of exposition and argument, although one may not be willing to accept the statements in all points. The chapter on the " Eelation of Logic to Nature " seems to solve a difficulty of long standing in the comprehension of Hegel's system. The last chapter, " Criticism," shows that the expositor is also an able critic. Into the various objections he makes we cannot enter here. Some of them are without doubt well taken. Others seem to get their plausibility from overstraining isolated expressions. But these latter are not important, and the critic recognises this when he says that they do not " seriously damage the real value of Hegel's general position, or of the Logic in particular " (p. 363). "We shall find," if we look at the subject in the fuller light of Hegel's larger meaning, "that most of the objections urged against it above cease to hold, while at the same time much of his System as it stands can be accepted as tenable " (pp. 367, 368). The book will not be altogether easy reading to a novice in the study of Hegel's philosophy ; but it will be easier reading than Hegel's own works, as most expositions of Hegel have not proved to be. Like all really helpful and useful commentaries, it must be read along with the works commented on, and thus read it will prove to be not a keeping but a disclosing of "the Secret of Hegel ". And even to one who has not had time or inclination to read the Obscure Philosopher par excellence of modern times, a careful study of this General Introduction to Hegel's System will show the nature and importance of Hegel's problem, the spirit in which he attacked it, and the partial success of his solution. Dr. Baillie's work cannot be too highly praised. EVANDER BRADLEY McGiLVARY. Mind in Evolution. BY L. T. HOBHOUSE. London : Macmillan, 1901. NOTWITHSTANDING some real divergence of opinion, and a much greater amount of apparent divergence due to differences in the usage of terms, there is a growing consensus of opinion among students of comparative psychology as to the main trend of mental development in animals and man. This is in part the outcome of a more careful, cautious and critical treatment of the recorded evidence, and in part the result of the application of the experi- mental method together with the appreciation of the fact that, if it is to afford data from which valid conclusions may be drawn, animal behaviour must be studied in the spirit of serious investigation.