LIST OF FIGURES 



INTRODUCTION 



PAGE 



1. Epidermis of larval salamander 3 



2. Section of growing root-tip of the onion ........ 4 



3. Aitialm Proteus ............. ^ 



4. Cleavage of the ovum in Toxoptieustes . . . . . . . . .11 



5. Diagram of inheritance . 13 



CHAPTER I 



6. Diagram of a cell ......... 



7. Spermatogonia of salamander ...... 



8. Group of cells, showing cytoplasm, nucleus, and centrosomes 



9. Living cells of salamander larva, showing fibrillar structure . 



10. Alveolar or foam-structure of protoplasm, according to Biitschli 



11. Structure of protoplasm in the echinoderm egg 



12. Aster-formation in alveolar protoplasm . 



13. Nuclei from the crypts of Lieberkiihn . 



14. Special forms of nuclei .... 



15. Scattered nucleus in Trachelocerca 



16. Scattered nucleus in Bacteria and Flagellata 



17. Ciliated cells 



18. Cells of amphibian pancreas . 



19. Nephridial cell of Clcpsinc . 



20. Nerve-cell of frog ..... 



21. Diagram of dividing cell 



22. Diagrams of cell-polarity 



23. Centrosomes in epithelium and in blood-corpuscles 



18 

 20 



21 



24 

 26 



27 

 28 



32 



35 

 37 

 39 

 43 

 44 

 45 

 47 

 49 

 56 

 57 



CHAPTER II 



24. Remak's scheme of cell-division . 



25. Diagram of the prophases of mitosis 



26. Diagram of later phases of mitosis 



27. Prophases in salamander-cells 



28. Metaphase and anaphases in salamander-cells 



29. Telophases in salamander-cells 



30. Mid-l)ody and cell-plate in cells o{ Liniax 



31. Middle phases of mitosis in Ascaris-t^^% 



32. Mitosis in Stypocaiilon .... 



xvii 



64 

 66 

 69 

 73 



75 

 76 



79 

 80 



