xii Contents 



Chapter IV. The Hypothetical Bearers of the Individual 

 Hereditary Characters. 



PAGE 



9. Introduction 62 



10. Darwin's Pangenesis 63 



11. Critical Considerations 66 



12. Conclusion 69 



PART II 



INTRACELLULAR PANGENESIS 



A. Cellular Pedigrees. 



Chapter I. The Resolving of Individuals Into the Pedigrees 

 OF Their Cells. 



1. Purpose and Method 79 



2. The Cellular Pedigrees of the Homoplastids 82 



3. The Cellular Pedigree of Equisetum f.. 83 



4. The Main Lines in the Cell-Pedigrees 88 



Chapter II. Special Consideration of the Individual Tracks. 



5. The Primary Germ-Tracks 93 



6. The Secondary Germ-Tracks 95 



7. The Somatic Tracks 100 



8. The Difference Between Somatic Tracks and Germ 



Tracks 103 



9. Phyletic, Somatarchic, and Somatic Cell-Divisions.. 107 



Chapter III. Weismann's Theory of the Germ-Plasm. 



10. The Significance of the Cell-Pedigree for the Doc- 

 trine of the Germ-Plasm 110 



11. The Views of Botanists 113 



12. A Decision Reached Through the Study of Galls.... 118 



B. Panmeristic Cell-Division. 



Chapter I. The Organization of the Protoplasts. 



1. The Visible Organization 125 



Chapter II. Historical and Critical Considerations. 



2. The Neogenetic and the Panmeristic Conception of 



Cell-Division 128 



3. Cell-Division According to Mohl's Type 134 



4. The Regeneration of Protoplasts After Wounding.. 139 



