The germ-plasm : a theory of heredity /

Abstract

The theory of ' evolution ' or ' preformation ' of the early physiolo¬ gists supposed that all parts of the fully-formed animal or plant were present, in a minute form, in the germ.The rival theory of 'epigenesis PREFACE.xviii during two winter sessions.My hearty thanks are also due to my friends and colleagues Professors Baumann, Liiroth, Wiedersheim, and Ziegler, as well as to Professor Goebel, of Munich, for information of various kinds; and I am no less indebted to Miss Else Diestel, who, in addition to much help of a technical nature, has also been at the great pains of preparing an alphabetical index.I thus venture to bring into the light of day a work which is the fruit of many years labour and of many doubts; and even though but few of my results should remain unmodified, I hope nevertheless that my work has not been in vain; for even error, if it originate in correct deductions, must become a step towards truth.

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