\ 





nh 



e 



I 



H 



^^%i 



) 



'^ncen^ 



nial 



^^tof 



Material; 



point of 2 u 



a 



•"I 



4^antitjof 

 carbon. 



1 and 



"^g the unloQ 

 '^v thence be 

 Dfioii of gun. 



as J 



addrefs, 

 ch of the ma- 



as happens, I 

 irc, which are 

 ontrary, wb 



of decompo- 



rogrefs. In 



kedby 



and thus pre- 



a the heap 



in its 



O 

 1 



cnec 



)0 



in 



nin 



of air 



verna 



1 r 



1 JU 



1 aiiti an- 

 the win- 



Sect.X. II. 6 



ding air in the interft 



MANURES 



47 



as 



tb 



of carbon with oxy 



^1^ 



and probably of azote with hydrogen, feems thus to be occafioned 



by which the th 



laft of thefe elements may change from a gaffe 



ous 



flat 



^ 



into a fluid one, and thus become abforbed by vegetable 



roots. 



Laftly, I conclude that in general the manure heap before (lables, 

 or in the fold-yard, fhould be placed on a gently rifing eminence, with 

 a bafon beneath it, that the fuperfluous water, which would 

 wife prevent the fermentat 



of the ft 



th 



ay drain off and be 



there received ; and that into this bafon, as often as a fluid appear 



it, 



fome earth, or weeds, or leaves, or faw-duft, or other veg 



ble or anim 



recrements fhould be thrown 



the fermentation and 



putrefaaion of which will be thus forwarded, and the carbonic drain- 



from the manure-heap will not be loft. 

 The admixture of lime with this carbonic foil is found by daily 



5 



xperience to produce the moft fertile compofit 

 f vegetables, and for the produdion of 



for the 



growth 



The great ufe of 



trous 



acid in vegetation h 



long been acknowledged 



and that of 



hyper-oxygenated marine acid appears probable from recent experi- 

 ments ; and would feem to be occafioned by the more loofe adhefioii 

 of the oxygen in thofe acids to their refpedive bafes ; which may 

 therefore in its fluid ftate.be more readily abforbed by vegetable roots. 

 One ufe therefore of the admixture of lime in fuch a compoft of foil 

 and manure is to arreft the nitrous acid, as it is formed, and by mak- 

 ing a calcareous nitre, prevent its exhalation, or its eafy elutriation 



from the other materials. 



6. A principal circumftance for the quicker and more perfed de- 



compofition of vegetable recrements is a due quantity of animal mat- 

 ter, and their being properly mixed together ; as appears from the 

 early experiments of fir John Pringle and Macbride, and by daily ex- 

 perience. There is neverthelefs great negka in this refpea in all 



thofe farm-yards, where the fwine have their food in fixed ftone- 



troughsa 



J, 



