Principles of Part I. 



but clay and dung enrich it to a prodigious 

 degree, and make it capable of bearing 

 a dry feafon, which of itfelf it can fo little 

 (land. While all vegetation was ftopt in 

 the foil alone, an addition of clay and 

 dung produced one of the beft crops that I 

 ever faw. 



Cor. 3. Though thefe conclufions agree 

 in general with regard to all forts of grain, 

 yet as different kinds were fown, I ob- 

 ferved that oats agreed better with clay, 

 and clay and lime, than either barley or 

 peafe ; but that the two laft agreed better 

 with the clay and dung than the oats. 



SAND, however hard it is, feems to be 

 moftly compofed of a mucilaginous, oily 

 fubftance; as appears by the following 

 trial. 



Exp. 9. February 9. I put ten gr. of pure 

 fea-fand, pounded in a mortar, into a phial 

 with one drachm of oil of vitriol ; the fame 



quantity 



