Seel. I, Agriculture and Vegetation. 45 



fhows that they contain more oily particles 

 than it do.s. 



Exp. 19. A pound and an half of fnow- 

 water being evaporated, gave 2 dr. of a 

 reddifh liquor, which had little tafte, and 

 difcovered nothing faline in it. I fet it in a 

 cellar for fourteen days j and when I took 

 it out, it was covered with a mouldy fub- 

 fiance. This mould, when dried, burnt on 

 a red-hot iron to a powder. Hence it ap- 

 pears, that fnow contains an oily fubftance, 

 Margraaf having evaporated a greater quan- 

 tity of fnow- water, difcovered the fame falls* 

 and earth as in rain-water. 



THE overflowing or water-flooding of 

 low grounds may be reckoned amongft 

 the natural methods of improving the foil; 

 becaufe fiat meadows are often naturally 

 overflowed, either by rains, or by the rain- 

 water falling from the higher grounds. Egypt 

 is naturally overflowed once a-year by 

 the Nt/e, and rendered by that means 



exceedingly 



