472 THE nor.. 



Now assuniinc^ 2 por cent, as the contents in azote of dry farm- 

 yard diini^:, we see that the food consumed by the horse, speaking- 

 theoretically, mij^ht or should form 'if). 5 lbs. of dry manure. r>ut 

 we have seen that ahorse or cow will exhale from ^{55.0 to ir;.8 

 «^rs. of azote, which is all derived from the lbt»d, and is consetjU ully 

 lost to the tlunij^-heap. Now 385. 9 c^rs. of azote represent 2.7;') ll)s. 

 of dry manun^ ; so that the dry dunuf produced by the horse kept in 

 the stable, will be reduced from 2C^S) lbs. to 23.1 lbs. In the course 

 of a year, upon this calculation, the azote exhaled will diminish tlii 

 weii^'-ht of dry dung produced by one horse by a quantity equal to 

 KM;") lbs. 



The azote of the food of a cow is still more considerable in quan- 

 tity, and tiie loss to tlu; dunirhill proportionally larger ; inasmuch as 

 to the amount she exhales, must be added all that goes to constitute 

 the milk she gives. I'ractical men, without pretending to get at 

 the cause of the thing, have long been aware of the fact, that a cow 

 ])roduccs less dung than a lu)rse ; and the truth of this is readily 

 demonstrated on scientific grounds, v^uppose a cow, consuming the 

 ecpiivalent of ',VA lbs. of hay. and giving ab(mt 17 pint^ of inilk p( r 

 day : 



44 " straw for litter contain. 



Azoto 2798 — 19.8 lbs. of dim j; supposoit to bo dry. 



But in the 24 hours, there have bciMi of 



Azote exhaled 895.9 (fralns, and of 



Azoto In 17 pints, or '22.7 lbs of milk carried off, 802.7 grains. 



11SS.6 — S.8 of dry dun^. 



The X\ lbs. of hay digested by the cow, con.sctiuently, the litter 

 added, have only product'd 8.H of dry »lung. The iizote of the food, 

 of which we find no account in the dejections, amounts per aimum 

 to nearly 'M) cwls., {'A'M){) lbs..) the deficiency in the case of the 

 horse amounting to no niore tiiau 10 If) lbs.. (I) cwts. 1 qr. 9 lbs.) 



The estimation of the dung j)roduced by growing animals, pre- 

 sents several special dilViculties. inasmuch as, besides the azote 

 exhaled from the lungs, there is the quantity that is fixed in the liv- 

 ing body. 



In one of the experiments which I have related, it appears that a 

 calf six months old, consuming : 



Hiiy 9.6 Ib.s. containing 1069.S aiot*. 



Dlschftri;o<J ,y Its dejections 88><.8 " 



Azote fixed r"" oxhaled In 24 hours ... 281.5 " 



The azote lost to tlie manure by tlie fixing of azote is therefore 

 very considtTalile. in t!»e ca.se of young animals as well as of milch- 

 kine. We find, for example, that for every 100 lbs. weight of hay 

 consumed : 



A horse ."supplies the equivalent of 51 lbs. of dry standard dung. 



A nillch-cow ... 82 " ' " 



A calf of six months 4"> 



