CONTENTS 



PAGES 



Chapter I. INTRODUCTION .... r-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 - - - - - lO 



A. ASEXUAL REPRODUCTION - - - II 



(a) DIVISION - - - - - II 



(6) BUDDING - - - - - 12 



(c) SPORULATION - - - - 16 



B. CONJUGATION - - - - "I? 



C. SEXUAL REPRODUCTION - - - - 18 



(a) HETEROGAMY - - - - 20 

 COPULATION - - - - 22 



(b) AUTOGAMY - - - "23 



(c) PARTHENOGENESIS - - - 24 



(d) ALTERNATION OF GENERATIONS - - ^S 



Chapter III. THE GERM-CELLS - - - 28-49 



I. — HISTORICAL - - - - - 28 



CELL, OVUM, SPERMATOZOON - - - 29 



II. — THE GERM-CELLS - - - - - 29 



(a) KARYOKINESIS - - - - "30 



(6) OVUM - - - - - -33 



(c) SPERMATOZOON - - - - " 3^ 



III. — MATURATION - - - - '3^ 



(a) OVUM - - - - - -37 



[b) SPERMATOGENESIS - - - - 41 

 IV. — FERTILIZATION - - - - - 42 



V. — DEVELOPMENT - - - - - 45 



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