-'^^.x. 



3 



^f fe 



is 



I 



'"'' the 



'^ "«° it, tU 



: I'e, 



J 



eair 





turned 

 atmofphere; 



'^o», and per! 

 Great heat 



r. 



~s of acidit 



J 



) 



"^ excite .J 

 partly owiiia 



c 





fore the feed 

 ;al produftion 



onverted Into 

 be a decora* 

 ;en; and it is 

 , as in hy- 

 a water, and 



)n 



rp 



aflinginto 



j^e nutriment 



fstobe 







W 



proce 

 nitre, 

 This appe^^; 



own 



in 



our 



e 



an 



d aiii^ 



it to 



the 



aif 



1 



Sect, X. 9 



MANURES 



233 



while it is defended by a (bed from the funfhinc and raiti; which 



thus at the fame time adapted to produ 



th 



qulckeft 



and to generate the nitrous acid. 

 The oxygen, which compofes 



more weakly 



bafe 



itrous acid, is believed to adhere 

 than in the compofition of other 



'I 



acids 



O 



th 



account it fo readily explodes by its jun£l 



th 



carbon in a given degree of heat. This loofe adherence of the oxygen 

 in nitrous acid, like that of hyper-oxygenated marine acid, and of 



the oxy 



m 



th 



ore of manganef( 



d of fome other me 



ydes, may adapt them to promote vegetation by their more readily 

 parting with this material fo effential in the compofition of plants. 



From the above obfervations it appears, that when the foil is 

 ed over by the fpade or plough, and thus acquires atmofph 



5 



terftices, and in confequence becomes warm by the pro- 



duct 



f 



d 



that the feeds or plants (hould be inferted 



foon as convenient, for the purpofe of their receiving the moft fa 



lutary efFe<St of thofe operation 



Nor (hould this be obferved 



black garden mould, or well manured slebes 



& 



wh 



carbon or 



phofphorus may be fuppofed to abound, and a proper difpofition for 

 the produdion of the nitrous acid, but in thofe clays alfo which arc 

 pure enough for the brick-kiln or the pottery. 



IX. 



MANURES BY CHEMICAL DECOMPOSITION 



The ufe of fire and water contributes to increafe the nourifhraent 



of mankind by rendering many vegetable ma 



innocuous, and 



others digeftablc in the animal ftomach ; and feems particularly effi- 

 cacious in promoting the faccharine procefs, and in producing muci- 

 lage from griflies, horn, hair, and perhaps even from bones by means 

 of Papln's digefter. Whether this art could be advantageoufly ufed 

 for the purpofe of rendering manures capable of being abforbed by 



Hh 



getable 



