LIST OF ILLUSTRATIONS. 



l! The lower Jaw Wilson 41 



2. Section of Stomach Author 42 



3. Digestive Tract Harrison 48 



4. Mucous Membrane of Stomach Wilson 50 



5. Stomach Follicles and Tubes Todd and Bowman 50 



6. Section of Stomach Tubes " " 51 



7. The Hydra 51 



8. Digestive Tract of Beetle Milne Edwards 58 



9. Mucous Membrane of Beetle's Stomach Photograph by Author 58 



10. Digestive Tract of Fowl " " 58 



11. Stomach of African Ostrich Cuvier 59 



of Dormouse " 59 



ofCapeHyrax " 59 



ofPorqppine " 59 



ofPorpoise " 59 



ofKangaroo " 59 



12. 

 13. 

 14. 

 15. 

 16. 



17. of a Ruminant " 59 



18. Posterior View of human Stomach Retzius 61 



19. Posterior View of Duodenum Bourgery 68 



20. Diagram of Brunner's Glands Author 69 



21. Diagram of Follicles of Lieberkuhn " 69 



22. Peyerian Glands Thomson 70 



23. Section of Heum Wall Kolliker 85 



24. Villi of Monkey Camera Lucida by Author 85 



25. Villi of Duodenum Author 85 



26. ViUi of Jejunum " 85 



27. Section of Villi " 86 



28. Villi of Squirrel " 88 



29. Principle of Venturi " 90 



30. Thoracic Duct Wilson 90 



31. Chyle Corpuscles with Blood-cells Photograph by Author 93 



32. " " " Water Author 94 



33. " " " Acetic Acid " 94 



34. Lymphatics of large Intestine Bourgery 97 



35. Diagram of Lymph Gland Goodsir 97 



36. Evolution of Lymph Cells " 97 



37. Capillary" Depression of a Liquid Author 104 



38. Capillary Elevation of a Liquid " 104 



39. Passage of Water through a Crevice " 105 



40. Endosmometer " 106 



41. Selecting Power of a Membrane " 108 



42. Human Blood-cells Photograph by Author 116 



43. Elliptic Blood-cells " " 116 



44. Action of Water on elliptic Cells " " 116 



45. Action of Acetic Acid " " 117 



> 46. Reptile Blood-cells " 117 



47. Human Blood-crystals Lehmann 119 



A 



