92 *Ihe Principles of Part II. 



this fe<ftion ; that is, foot. This is found, 

 by chymical experiments, to be a compofi- 

 tion of volatile alkaline fait, oil, and a little 

 earth. It is remarked, that the effects of 

 this compoft are very fudden, they being 

 obfervable after the firft rains. 



SECT. VII. 



Of animal manures. 



AL L animal fubftances enrich ground 

 prodigiouily ; fuch as, blood, gar- 

 bage, urine,. &c. becaufe they putrefy ea- 

 iily. As we have treated of dung, we need 

 not fpeak of thefe. But there are other 

 animal fubftances, fuch as {havings and 

 tips of horns, hair, filk, woollen rags, &c. 

 which do not feem, from their firm tex- 

 ture, to be fo capable of putrefaction. All 

 thefe contain a great quantity of a muci- 

 laginous and gelatinous fubftance, capable 

 of being diffolved by water, of a fapona- 

 ceous nature, and conlifling, as appears 

 by chymical experiments, of falts and oils 



intimately 



