CONTENTS 



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I. Statement of Weismann's System up to the 



Year 1886 1 



II. Later Additions to Weismann's System up to the 



YEAR 1892 28 



III. Weismann's Theory of Heredity (1891) ... 48 



IV. Examination of Weismann's Theory of Evolution 



(1891) 86 



V. Weismannism up to date (1893) 117 



Appendix I. — On Germ-plasm 173 



„ II. — On Telegony 191 



