178 e He Principles of Part IV; 



tions of the air-veflels, and perhaps by 

 the particles of light taken in at the leaves. 

 The juices are rendered richer by the expul- 

 fion of the watery particles. The remaining 

 ones are partly applied to the extremities of 

 the veflels, which run in all directions, ho- 

 rizontally as well as perpendicularly, and 

 make the plant increafe in breadth and 

 length j and partly go to the formation of 

 leaves, flowers, fruit, &c. 



IT is eafily conceived how plants, by the 

 different combinations of the five principles 

 of which their food is compofed, and 

 the combination of thefe in different de- 

 grees, mud differ very much in their juices 

 and products. If their groffer particles 

 are to be feparated for any ufe, the fub- 

 tiler are all carried off by lateral veflels, 

 until none are left but what are wanted ; 

 if the fubtiler particles are to be ufed, they 

 are to be feparated by fmall veflels fitted 

 to receive them, implanted in the larger, 

 or in the cells where the juices are depo- 



pofited 



