The lecture on Natural Selection and the antiquity of life is replete with original and pregnant suggestions based upon the results of his own profound investigations on pelagic life. Here again only ample quotations from his pages would convey an adequate idea of their value and importance. In his chapter on Louis Agassiz and George Berkeley he gives this just tribute to Agassiz: "The writer was a man of transcendent genius for scientific discovery, with intense earnestness and enthusiasm for the pursuit of truth, and rare eloquence and literary skill. If any man was devoted to the cause of truth and determined to accept it, whatever it might prove to be, that man was Agassiz; for while his impulses were notably devout and reverential, he proved, on many occasions, that he was fearless and independent in the search for truth. It is no disparagement to Buckland and Bell and Chalmers and the other authors of the Bridgewater Treatises to assert that Agassiz far surpassed them all in acquaintance with the methods which lead to success in the interpretation of Nature, and in ability to treat the problems of natural theology from the standpoint of the zoölogist." He dedicates his book to Bishop Berkeley, and throughout the lectures his references indicate a thorough acquaintance with the writings of this eminent scholar. Paley's old watch comes in for renewed consideration, and one wonders if the mainspring of this device will ever be broken. His apt references to classical authors indicate wide and judicious reading. The book is overburdened with thought and clear, concise reasoning, and his final advice should be followed when he urges his readers to do double duty by reading the book again. * * * * *