NEW HUSBANDRY EXEMPLIFIED. 9 



more (except flieer, fharp fands, which con- 

 tain none of it, or very little): but rich 

 loams, and rich clays, contain the largeft 

 proportion. This matter, fo far as it can be 

 traced by the eye or microfcopes, appears to 

 be fand, and probably it is all fand ; for fucli 

 of it as is too fine to be denominated fo with 

 certainty, has the fame colour and appear- 

 ance as that part of it that is feen to be fand. 

 There are other means of difcoverins: the na- 



o 



ture and qualities of the rmeft part of this 

 matter : and it is recommended to the curious 

 to examine it further. 



The furface of fmall bodies is larger than 

 the furface of bodies that are greater, in pro- 

 portion to their refpective folidities ; and 

 when the furfaces of the fmaller bodies are 

 joined, they touch in more points than the 

 larger, and therefore cohere more ftrongly. 

 Hence clayey foils have a ftronger cohelion 

 than loams whofe parts are larger; and, for 

 the fame reafon, loams cohere more flrongly 

 than fands or- gravels. Pure clays, having 

 neither ftones nor coarfe fand in them, co- 

 here very ftrongly, are of difficult tillage, 

 and require great ftrength of cattle ; whereas 

 fands having larger parts, and touching in 

 few points, are loofe and eafily tilled ; fome 

 of them tilled as eafjly by one horfe as ftrong 

 clays are by three or four. A loam that con- 

 fids of a juft proportion of large and fmali 



pares, 



