69 



CHAPTER X, 



OF THE SECRETED FLUIDS OF PLANTS 

 GRAFTING. HEAT OF THE VEGETABLE 

 BODY. 



The sap in its passage through the leaves 

 and bark becomes quite a new fluid, possess- 

 ing the peculiar flavour and qualities of the 

 plant, and not only yielding woody matter 

 for the increase of the vegetable body, but 

 furnishing: various secreted substances, more 

 or less numerous and different among them- 

 selves. These accordingly are chiefly found 

 in the bark ; and the vessels containing them 

 often prove upon dissection very large and 

 conspicuous, as the turpentine-cells of the 

 Fir tribe. In herbaceous plants, whose stems 

 are only of annual duration, the perennial 

 roots frequently contain these fluids in tfye 

 most perfect state, nor are they, in such, 



