23 



MANURES 



Sect.X. 8. 3 



I 



\ 



horfe dung and flraw, was become too 



cold for the growth of h 



pot 



mbe 



H 



defired fimp 



turn 



th 



bed 



d fliake every part of 



h his fork, as he lightly 



placed it. This was complied with, and in a few days I obferved by 



o 



flick, which had for fome hours been inferted 



■ 

 1 



it had acquired the ufual heat of a hot-bed. 



This addition of heat was doubtlefs acquired from the air, which 



r 



was recently included in the interflices of the bed by its being turned 



over, broken into fmall pieces, and expofed to th 



ofpl 



hence new acids feem to have been generated, and carbon, and per- 

 ms phofphorus and nitrogen, rendered foluble in water. Great heat 



produced from 



of oxygen with thofe bafes of acidity 



hich in large flacks of new hay is often known to excite real 



ombufiion ; the violent fermentation of which may be partly owing 

 the fugar, which is depofited in the joints of grafs before the feeds. 



^nt, and partly to a chemical produflion 



pe for th 



fhm 



offu 



o 



above defcribed 



2. In the putrefadive proccfs carbon is 



ly 



erted 



carbonic acid, as above related ; but there appears to be a decom 



pofition 

 probabl 



f water, as is k 

 this ii 



lown by the fmell of hydroi 

 flammable body may unite with carb 



d 



hy 



<3rocarbonate gas, and thus render them both foluble in water, and 

 abforbable by the veflels of vegetable roots, without their pafling into 

 an acid or gaileous form, and may much contribute to the nutriment 

 of vegetables. 



4. There alfo appears at the end of the putrefadlive procefs to be 

 ajundion of azote with oxygen producing the acid of nitre, which 



probably may contribute much to promote 



to 



This appea' 



d 



from the mode of procuring that acid in France and PrufTia, ai 

 which might be fuccefsfully pradlfed under every fhed in our own 

 farm-yards ; as it confifls in a due mixture of vegetable and animal 



recrements with foil, frequently turned over to expofe it to th 



w h ik 



