LIST OF FIGURES 



INTRODUCTION 



1. Epidermis of larval salamander 



2. Section of growing root-tip of the onion 



3. Avioeba Proteus . . . . . 



4. Cleavage of the ovum in Toxopneustes . 



5. Diagram of inheritance . . 



PAGE 



4 

 1 1 



CHAPTER I 



6. Diagram of a cell ......••• 



7. Spermatogonia of salamander ...... 



Group of cells, showing cytoplasm, nucleus, and centrosomes 

 Living cells of salamander larva, showing fibrillar structure . 

 Alveolar or foam-structure of protoplasm, according to BiitschU 

 Structure of protoplasm in the echinoderm e^ 

 Aster-formation in alveolar protoplasm . 

 Nuclei from the crypts of Lieberkiihn . 

 Special forms of nuclei .... 



Scattered nucleus in Trachelocerca 

 Scattered nucleus in Bacteria and Flagellata 

 Ciliated cells . 

 Cells of amphibian pancreas 



8. 



9. 

 10. 



II. 



12. 



13- 

 14. 



15- 

 16. 



17- 

 18. 



19. 



20. 



21. 



22. 



2^. 





Nephridial cell of Clepsine 



Nerve-cell of frog . 



Diagram of dividing cell 



Diagrams of cell-polarity 



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 11 



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-body and cell-plate in cells of Umax 



31. Middle phases of mitosis in Ascaris-Qgg% 



32. Mitosis in Stypocaulon .... 



xvii 



64 

 66 



69 



73 



75 

 76 



79 

 80 

 Si 



