The title of Mr. Claremont's book is so happy, its aim and scope as set forth in the introduction sounds so realistic yet comprehensive, that we are led to expect great things. For what could be more appealing than this description (Introduction, p. 20) of his purpose?

'This book has no pretensions to be a philosophical book. It is the much more limited book of a scientist; of a scientist moreover, who is really writing science and not philosophy'; and again (Introduction, p. 22): 'The present work is of the synthetic type. It … results simply from marshalling certain facts, scientifically obtained, in their