▼I CONTENTS. 



CHAPTER IV. 

 Of Germination 77 



CHAPTER V. 

 Of the Nourishment of Plants . . ... 80 



Article 1. The Influence of Carbonic Acid upon Nu- 

 trition 80 



2. The Influence of Oxygen Gas upon Nutri- 



tion 82 



3. The Influence of Air upon Fruits . . 85 



4. The Influence of Water upon Nutrition . 89 



5. Of the Efiects of the Nourishment of Plants 



upon the Soil 92 



6. Summary of the Changes produced in Plants 



by Nourishment 99 



CHAPTER VI. 

 Improtement of the Soil 106 



CHAPTER VII. 

 Of the Succession of Crops 120 



Principle 1. All plants exhaust the soil . . . 121 



2. All plants do not exhaust the soil equally . 121 



3. Plants of different kinds do not exhaust 



the soil in the same manner . . . 123 



4. All plants do not restore to the soil either 



the same quantity or the same quality of 

 manure 124 



5. All plants do not foul the soil equally . 124 



CHAPTER Vni. 

 YiBw OF THE Products of French Agriculture . 131 



