524 



Agricultural Chemistry. — Pig Feeding. 



ever, more than compensated by the amount of nitrogenous 

 matter consumed ; and there is, with this larger amount of nitro- 

 genous matter in the food, upon the whole a somewhat larger 

 amount of total organic substance consumed in the first set of 

 four pens than in the second. If we now look down these 

 columns, either of total dry organic matter, or of non-nitrogenous 

 substance, and exclude, as we may, pens 9, 10, and 11 (in which 

 there was given the excessive amounts of bran, and the foods 

 could not be considered as of fattening quality), we cannot fail to 

 see, a very close uniformity in the amounts consumed of both 

 these classes of constituents throughout the nine pens. Thus, 

 taking first the non-nitrogenous substance, the range throughout 

 these nine comparable pens is between the two extremes of 

 17^ lbs. and 22^ lbs. Again, in the column of total organic 

 substance, the range in these nine pens is from 22 lbs. to nearly 

 28 lbs. ; but among eight of them, it is only from 24-5- lbs. to not 

 quite 28 lbs. The column of nitrogenous substance, on the other 

 hand, shows a range in the amount of weekly consumption per 

 100 lbs. live weight of animal, in these nine pens, of from 2"9 lbs. 

 in pen 5, to 8'8 lbs. in pen 1. The range of difference, there- 

 fore, in the amounts of nitrogenous substance consumed, instead 

 of being, as with the other two constituents, in the highest only 

 about 25 per cent, above the lowest, is more than 200 per cent. 



Turning now to Table XXIIL, which gives the same par- 

 ticulars for the Second Series of experiments, owing to the 

 generally better balance of the constituents of the foods through- 

 out this Series, we need not exclude any of the 12 pens from 

 our comparison. Looking first at the column of total non- 

 nitrogenous substance (see Division 2), we find the range of 

 weekly consumption per 100 lbs. live weight of animal, to be 

 from 14^ lbs. to 23^ lbs. This is, it is true, a considerably 

 greater range in the amounts of non-nitro2:enous matter consumed, 

 than in the pens we compared in Series I. If, however, we were 

 to exclude pens 1 and 8 from the comparison in this Second 

 Series, we should find, that the amounts of non-nitrogenous 

 matter consumed in the remaining ten pens range only from 

 19'9 lbs., or say 20 lbs., to lbs. ; and again, the range in the 

 amounts of the total organic substance, consumed in these ten 

 pens, is only from about 25 lbs. to 31 lbs. The difference in the 

 amounts of nitrogenous matter consumed, however, is from 

 3'9 lbs. to 8*7 lbs — the highest being, therefore, more than 120 

 per cent, above the lowest. 



Comparing the Second Series with the First, the amounts of 

 non-nitrogenous substance consumed weekly per 100 lbs. live 

 weight, are more uniform throughout the former than the latter. 

 They are, however, rather higher in the Second Series with the 



