LIST OF FIGURES 



INTRODUCTION 



PAGE 



1. Epidermis of larval salamander 3 



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



3. Amoeba Proteus 5 



4. Cleavage of the ovum in Toxopneustes 1 1 



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 



1 6. 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 64 



25. Diagram of the prophases of mitosis 66 



26. Diagram of later phases of mitosis 69 



27. Prophases in salamander-cells 73 



28. Metaphase and anaphases in salamander-cells 75 



29. Telophases in salamander-cells 76 



30. Mid-body and cell-plate in cells of Limax 79 



31. Middle phases of mitosis in Ascaris-eggs 80 



32. Mitosis in Stypocaulon 81 



xrii 



