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MAY 1 4 1928

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PREFACE.

My warmest thanks are due to Mr. Francis

Darwin, to Mr. E. B. Poulton (whose interest in the subject here discussed is shown by his share in the translation of Weismann's Essays on Heredity), and to Professor Romanes, for the help afforded by their kindly suggestions and criticisms, and for the advice and recommendation under

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which this essay is now published. Encourage

ment from Mr. Francis Darwin is to me the more

precious, and the more worthy of grateful recog

nition, from the fact that my general conclusion that acquired characters are not inherited is

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