CONTENTS 



CHAPTER PAGE 



I. INTRODUCTION i 



II. EARLIER THEORIES OF HEREDITY 4 



III. THE INHERITANCE OF ACQUIRED CHARACTERS . 16 



***** IV. MENDEL'S LAW 28 



V. NEO-MENDELISM 40 



VI. NEO-MENDELISM (Continued) 52 



VII. NEO-MENDELISM (Continued} 63 



VIII. NEO-MENDELISM (Continued) 76 



IX. NEO-MENDELISM (Concluded) 86 



X. NON-MENDELIAN INHERITANCE ...... Q7 



XI. MODIFICATION OF UOTT CHARACTERS .... 104 



XII. PARTHENOGENESIS AND VEGETATIVE APOGAMY . 115 



XIII. INHERITANCE IN GAMETOPHYTES 123 



XIV. SELF-STERILITY 133 



XV. THE ENDOSPERM IN INHERITANCE 144 



XVI. HYBRID VIGOR 158 



XVII. SEX DETERMINATION 177 



XVIII. THE BEARERS OF HEREDITARY CHARACTERS . . 198 



INDEX 209 



ix 



