LIST OF ILLUSTRATIONS. 



FIGURE PAGE 



1. Figure illustrating osmosis . . . . . 30 



2. Figure illustrating osmosis . . . . . 31 



3. Diagram of the intestinal walls . . . . . 32 



4. Diagram of a single villus ...... 33 



5. Enlarged figure of four cells in the villus membrane . 33 



6. A bit of muscle showing blood-vessels . . -36 



7. A bit of bark showing cellular structure . . .61 



8. Successive stages in the division of the developing 



egg 63 



9. A typical cell ........ 65 



10. Cells at a root tip . . . . . .66 



11. Section of a leaf showing cells of different shapes . 66 



12. Plant cells with thick walls, from a fern . . -67 



13. Section of potato ....... 67 



14. Various shaped wood cells from plant tissue . . 68 



15. A bit of cartilage 68 



16. Frogs' blood ........ 69 



17. A bit of bone ........ 69 



1 8. Connective tissue ....... 70 



19 A piece of nerve fibre ...... 70 



20. A muscle fibre ........ 71 



21. A complex cell, vorticella ...... 71 



22. An amoeba ........ 73 



23. A cell as it appears to the modern microscope . . 86 



24. A cell cut into pieces, each containing a bit of 



nucleus ......... 89 



25. A cell cut in pieces, only one of which contains any 



nucleus ......... 90 



26. Different forms of nucleii ...... 93 



27 and 28. Two stages in cell division . . . .96 



