XXVI TABLE OF CONTENTS 



CHAPTER IV 



Absorption of Ash-constituents 



Page 



i. Cultures in artificial media 82 



2. Importance of the essential ash-constituents 84 



3. Importance of the non-essential ash-constituents 85 



4. Ash-analysis of plants 88 



5. Microchemical ash-analysis 9° 



6. The plant and the soil 9 2 



Summary io2 



CHAPTER V 



Absorption of Materials in General 



1. Materials absorbed by plants io 4 



2. Diffusion of gases io 4 



3. Absorption of gases io 5 



4. Diffusion of dissolved substances io 9 



5. Absorption of dissolved substances 119 



Summary .126 



CHAPTER VI 



Movement of Materials in the Plaxt 



1. General occurrence of movement of materials 13° 



2. Movement of gases I 3° 



j. Movement of water and dissolved substances 133 



4. The transpiration stream r 34 



(a) Transpiration T 34 



(b) Exudation pressure 140 



(c) Movement of water in the stem I 43 



5. Movement of organic substances v . . . I 48 



Summary r 5° 



CHAPTER VII 



Material Transformations in the Plant 



1. The cell as the physiological unit x 54 



2. Proteins r 55 



3. Enzymes z ^3 



4. Protein decomposition in plants x 7° 



5. Nitrogenous products of protein decomposition i?5 



6. Protein synthesis in plants I 78 



7. Alkaloids, toxins and antitoxins I 8i 



8. Lipoids and phosphatides x 83 



9. Carbohydrates I 85 



10. Glucosides J 87 



11. Organic acids x 88 



12. The importance of water in plants x 88 



13. The germination of seeds l &9 



Summary I 9 2 



