Principles of Part III. 



Aug. 2. The rain-water appears ftill beft. 

 22. I cannot fay which is beft, as they are 

 both fo fickly. 



THESE are all the experiments which I 

 have made with regard to the effeds of 

 different bodies on vegetation. This field 

 has not been cultivated with that attention 

 which the merit and importance of the fub- 

 jedl requires. It is indeed extenfive, as it 

 takes in the operations of all bodies which 

 can be either dirTolved or attenuated, fo as to 

 enter the veffels of plants. But it is only 

 from a number and variety of trials made 

 in it, that we can expecl to fee a juft theory 

 of vegetation arife. I could wifh, before I 

 attempt that fubjecl, to be pofleffed of a 

 greater number, and thofe oftener repeated, 

 that my conclufions might have been more 

 general and more certain. They were fuch 

 as appeared to me to refult naturally from 

 the experiment. How far they are to claim 

 aflent, I have left in every one's power to 

 judge. SECT. 



