XXvill 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 °5 



4. Ash-analysis of plants 8 ^ 



5. Microchemical ash-analysis 9° 



6. The plant and the soil 9 2 



7. Oxygen absorption from the soil io2 



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 n 9 



Summary I2 ° 



CHAPTER VI 



Movement of Materials in the Plant 



1. General occurrence of movement of materials *3 



2. Movement of gases I 3° 



3. Movement of water and dissolved substances *33 



4. The transpiration stream J 34 



(a) Transpiration *34 



(b) Exudation pressure I 4° 



(c) Movement of water in the stem 143 



5. Movement of organic substances J5 1 



Summary J 53 



CHAPTER VII 



Material Transformations in the Plant 



1. The cell as the physiological unit 157 



2. Proteins J 5° 



3. Enzymes I °" 



4. Protein decomposition in plants 1 73 



5. Nitrogenous products of protein decomposition 178 



6. Protein synthesis in plants I ° I 



7. Alkaloids, toxins and antitoxins l8 4 



8. Lipoids and phosphatides l8 6 



9. Carbohydrates J &° 



10. Glucosides I 9° 



11. Organic acids X 9 T 



12. The importance of water in plants J 9 2 



13. The germination of seeds l 93 



Summary x 95 



