CONTENTS 



PAGES 



CHAPTER I. INTRODUCTION - - - 1-3 



THE NEED OF THE SCIENCE OF HEREDITY - I 



CHAPTER II. REPRODUCTION - ... 4-27 



I. INTRODUCTORY - . - 4 



(a) BODY AND CELL 5 



(b) REGENERATION - - 8 



(c) ARTIFICIAL DIVISION 9 

 II. REPRODUCTION --" - - - IO 



A. ASEXUAL REPRODUCTION - II 



(a) DIVISION - II 



(b) BUDDING - 12 



(c) SPORULATION - l6 



B. CONJUGATION - - I? 



C. SEXUAL REPRODUCTION - 1 8 



(a) HETEROGAMY - 2O 

 COPULATION - 22 



(b) AUTOGAMY - 23 



(c) PARTHENOGENESIS - 24 



(d) ALTERNATION OF GENERATIONS - '2$ 



CHAPTER III. THE GERM-CELLS - 28-49 



I. HISTORICAL - 28 



CELL, OVUM, SPERMATOZOON - 2Q 



II. THE GERM-CELLS - 29 



(d) KARYOKINESIS - - - 3O 

 (b) OVUM - "33 

 (C) SPERMATOZOON - 36 



III. MATURATION - 36 



(a) OVUM - - 37 



(b) SPERMATOGENESIS - 4! 

 IV. FERTILIZATION - 42 



V. DEVELOPMENT - - - 45 



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