Sect. I. Agriculture and Vegetation* 121 



Cor. i. The aereal nitre promotes vege- 

 tation very much. This fait we elfewhere 

 prove to be the foflil alkali. 



Cor. 2. The eflential fait of rhenifh wine 

 promoted vegetation a little. The fame 

 fait neutralized, had very ftrong effects on 

 the growth of plants. 



THAT I might difcover the natural ef- 

 fects of rain-water, 



Exp. 36. May 23, 1758, I took two pots 

 filled with poor earth, {owed fome barley 

 in each, and placed them near the window 

 of a green-houfe, fo that they might get 

 air, but no rain. N Q I. was conflantly 

 watered with fpring- water.' N 2. with 

 the fame quantity of rain-water. 



June 10. The plants watered with rain- 

 water, feem the beft ; but thofe of both 

 pots appeared fickly for want of a fufficient 

 quantity of air. 



