COPYRIGHT, 1929, 1930 BY FREDERICK TILNEY ALL RIGHTS RESERVED PRINTED IN THE UNITED STATES AT THE COUNTRY LIFE PRESS GARDEN CITY, N. Y. Race after race of man has appeared on this earth, lasted but a short span of time, and then met disaster and extinction. Our modern race is of this series. We have reason to believe that it differs in quality from its forerunners chiefly in its cerebral endowment. That its progress from animalhood to civilization is due to this endowment, is not questioned, for its victory over environment, its ascendency over all other animals is plainly due to its superior brain power.…
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