Agricultural CJiemistry. — Pig Feeding. 



525 



Barley-meal, tlian in the first with the Indian corn. But, if we refer 

 to the columns of fatty matter for the two Series respectively, we 

 see, that there is always a somewhat larger amount consumed of 

 this substance, with its high respiratory and fat-forming capacity, 

 in the food of the First Series, than in that of the Second ; and, the 

 due allowance for this, would in several cases make the di{ferences 

 in the amounts of non-nitrogenous matter consumed in the two 

 Series, even somewhat more inconsiderable. 



In the Third Series (see Division 2, Table XXIV.), we have 

 the range in the non-nitrogenous matter consumed, from about 

 16^ lbs. to about 25^ lbs. ; and in the total dry organic substance, 

 from about 21 lbs. to about 31^ lbs. On the other hand, in this 

 Series, with the highly nitrogenous Cod-fish, we have, in the 

 amounts of nitrogenous matter consumed, a very small range 

 throughout these five pens compared with that in the other Series 

 — it being only from 4*3 lbs. to 5*9 lbs. We shall see presently, 

 however, that although there v/as in this Third Series, a less range 

 in the amounts of nitrogenous substance consumed weekly per 

 100 lbs. live weight, than in those either of the pure non-nitro- 

 genous, or of the total organic constituents — yet, there was, in the 

 amounts consumed to produce a given weiglit of increase in this 

 Series, a wider l ange in the column of nitrogenous than in that of 

 the other constituents. 



Throughout these experiments, then — in which the animals 

 were allowed to fix for themselves the limit of their consumption, 

 according to the composition of the foods within their reach — we 

 have, as shown in the Tables XXII., XXIII., and XXIV., a 

 very striking coincidence in the amounts of pure non-nitrogenous, 

 or of total dry organic matter, consumed weekly for 100 lbs. live 

 weight of animal ; and, with the slight exception in Series 3, a very 

 much greater diversity in the amount of the nitrogenous constituents 

 so consumed. There are, indeed, some exceptions to the regularity 

 in the amounts of non-nitrogenous, and of gross organic substance 

 consumed ; most of which are found however, on examination, to 

 prove no exceptions to the conclusion — that, other things being 

 equal, it was the respiratory and fat-forming exigencies of the 

 animals, and not the supplies of the nitrogenous substances in 

 the food, that regulated the amounts of it consumed. Thus, in 

 Series I., we have in pens 9, 10, and 11 a generally less amount 

 of non-nitrogenous and total organic substance, but especially of 

 the latter, consumed to a given weight of animal, than in the 

 other pens. But, the difference in the amounts of these substances 

 available for the purposes of the animal economy, in these pens 

 as compared with the rest, is in fact much greater than the figures 

 in the Table seem to indicate ; for, it will be remembered, that 

 in these a very large proportion of the food was Bran, containing 



