LIST OF FIGURES 



INTRODUCTION 



PAGE 



1. Epidermis of larval salamander .......... 3 



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



3. Antceba Proteus ............. 5 



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



5. Diagram of inheritance ............ 13 



CHAPTER I 



6. Diagram of a cell ..18 



7. Spermatogonia of salamander .......... 20 



8. Group of cells, showing cytoplasm, nucleus, and centrosomes .... 21 



9. Living cells of salamander larva, showing fibrillar structure . . , . .24 



10. Alveolar or foam-structure of protoplasm, according to Biitschli .... 26 



11. Structure of protoplasm in the echinoderm egg ....... 27 



12. Aster-formation in .alveolar protoplasm 28 



13. Nuclei from the crypts of Lieberkiihn ......... 32 



14. Special forms of nuclei ............ 35 



15. Scattered nucleus in Trachelocerca ......... 37 



16. Scattered nucleus in Bacteria and Flagellata ........ 39 



17. Ciliated cells .............. 43 



18. Cells of amphibian pancreas ........... 44 



19. Nephridial cell of Clepsine ........... 45 



20. Nerve-cell of frog -47 



21. Diagram of dividing cell ........... 49 



22. Diagrams of cell-polarity ........... 56 



23. Centrosomes in epithelium and in blood-corpuscles ..... -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-body and cell-plate in cells of Li max 



31. Middle phases of mitosis in Ascaris-eggs 



32. Mitosis in Stypocaulon .... 



xyii 



64 

 66 

 69 



73 



75 

 76 



79 

 80 



81 



