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REVIEWS 27I is conclusive. Throughout, the author has taken pains to show what part the warlike instinct has played in the past, and then shows that at present resort to arms is already an evolutionary vestige. The author, considering that he is a scientific man, has a very good popular style. He is perhaps more fond of technical terms and casual references than he should be. Biologists entirely unknown to the general reader, to whom the book is directed, are casually mentioned by the score anddoi:10.1086/212083 fatcat:v7jbn4s2uvdtdatvfyrqqheqte