CONTENTS. 



(References are to paragraphs.) 

 CHAPTER I. 



PROTOPLASM. 



The plant spirogyra, 4. Chlorophyll bands in spirogyra, 5. 

 The spirogyra thread consists of cylindrical threads end to 

 end, 6. Protoplasm, 7. Cell-sap in spirogyra, 8. Reaction 

 of protoplasm to certain reagents, 9. Earlier use of the 

 term protoplasm, n. Protoplasm in mucor, 12. Mycelium 

 of mucor, 13. Appearance of the protoplasm, 14. Move- 

 ment of the protoplasm in mucor, 15. Test for protoplasm, 

 16. Protoplasm in nitella, 17. Form of nitella, 18. Inter- 

 node of nitella, 19. Cyclosis in nitella, 20. Test for proto- 

 plasm, 21. Protoplasm in one of the higher plants, 22. 

 Movement of protoplasm in the higher plants, 23. Move- 

 ment of protoplasm in cells of staminal hair of spiderwort, 

 24. Cold retards the movement, 25. Protoplasm occurs in 

 the living parts of all plants, 26 page I 



CHAPTER II. 



ABSORPTION, DIFFUSION, OSMOSE. 



Osmose in spirogyra, 30. Turgescence, 31. Experiment with 

 beet in salt and sugar solutions, 32. Osmose in the cells of 

 the beet, 34. The coloring matter in the cell-sap does not 

 readily escape from the living protoplasm of the beet, 35. 

 The coloring matter escapes from dead protoplasm, 36. 

 Osmose experiments with leaves, 37. Absorption by root- 

 hairs, 39. Cell-sap a solution of certain substances, 40. 

 Diffusion through an animal membrane, 41. Importance of 

 these physical processes in plants, 44 page 13 



