4. 



CHAPTER 2. 

 general physiology, or life op the whole plant . 773 



Section 1. 



FOOD OF plants AND ITS SOURCES . .774 



1. The Organic Constituents and their Sources . .774 



2. The Inorganic Constituents and their Sources . . 777 



Rotation of Crops 777 



Section 2. 

 life of the whole plant, or the plant in action 778 



1. Absorption . 779 



2. Distribution of Fluid Matters through the Plant, and 



their Alteration in the Leaves .... 780 



Ascent of the Sap .781 



Changes of the Crude Sap in the Leaves, &c. . . 783 

 Descent of the Sap 785 



