LIST OF ILLUSTRATIONS. 



Pia. PAQE 



1. An Amoeba at two different moments 3 



2. A cell . . ... . 5 



3. Diagram of indirect nuclear division . . .6 



4. Simple epithelium : A, B squamous, C columnar 7 



5. Stratified epithelium : A squamous, B columnar 7 



6. A ciliated cells, B columnar cells . . 8 



7. Simple epithelium with a cuticle . . 8 



8. A columnar epitheliimi with goblet cells, B other gland cells 8 



9. Diagrams of different glands . . 9 



10. Hyaline cartilage ... ... 10 



11. Bone . . .10 



12. Pat cells .... 10 



13. Muscle cells and fibre . 11 



14. ConnectiTe tissue and smooth muscle-cells 12 



15. Various ganglion cells ... 13 



16. Diagrams of a sucker 14 



17. Diagram of a nervous system ..... 17 



18. Section through a small piece of the antenna of an Insect 19 



19. Auditory capsule of a Gastropod . . 20 



20. Different forms of optic organs . . . 21 



21. Different kinds of Arthropod eyes . 22 



22. Diagrams of hearts ... . . ... 26 



23. Diagram illustrating the usual relations of the respiratory organs to the 



vascular system .... . . . 29 



24. Human ovum ..... . 33 



25. Diagram of an ovum with many yolk spherules . . .33 



26. Spermatozoa of different animals ... 33 



27. Diagram of the formation of polar bodies . . 34 



28. Diagram of fertilisation .... .35 



29. Stages in the development of an ovum . 42 



30. Stages in the development of the ovum of a Water-snail . . . 43 



31. Section through the egg of a Chsetopod at different stages of development 43 



32. Gastrula of a marine Gastropod ... .44 



33. Diagrammatic figures of the formation of the epibolic gastrula ... 44 



