TABLE OF CONTENTS 



Chapter I. Cell Genetics 



1. The Nucleus, the Cell and the Organism 



2. Reproduction ..... 



3. Heredity ...... 



I 



4 

 12 



Chapter II. Mitosis : The Constancy of the Chromosomes 



1. The Resting Nucleus : Nucleoli ...... 



2 . The Movements of the Chromosomes . . . . . 



3. The Structure of the Chromosomes . . . . . 



4. Abnormal Forms of Mitosis ...... 



Chapter III. Mitosis : The Variation of the Chromosomes 



1. The Mitotic Constants ....... 



2 . Genotypic Control ....... 



3. Numerical Variation ...... 



4. Structural Variation ....... 



5. The Comparative Morphology 



plement 



of the Chromosome Com- 



19 



22 



31 



47 



52 



53 

 60 



69 

 75 



Chapter IV. Meiosis in Diploids and Polyploids 



1. Introduction 



2. Outline of Meiosis 



3. Meiosis in Diploids . 



4. Meiosis in Polyploids 



5. The Conditions of Meiosis . 



Chapter V. Structural Hybrids 



1. Classification by Function . 



2. Meiosis in Structural Hybrids 



3. The Conditions of Metaphase Pairing . 



4. Chromosome Pairing in Undefined Hybrids 



5. Permanent Prophase : the Salivary Glands 



Chapter VI. The Behaviour of Polyploids 



1. The Origin of Polyploids in Experiment 



2. Pairing, Segregation and Fertility 



3. Polyploid Species .... 



4. Differential Affinity : Autosyndesis 



5. Classification of the Polyploid Species. 



6. The Development of Polyploid Species 



7. The Inference of Polyploidy 



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