Agricultural Chemistry. — Pig Feeding. 531 



former Series. Thus, among the whole twelve pens, with their 

 as many different dietaries, the range in the amounts of the non- 

 nitrogenous matter, consumed to produce lOOlbs. of gross increase, 

 is only from 317 lbs. to 385 lbs. ; and, that of the total organic 

 substance, from 408 lbs. to 511 lbs. ; but, that of the nitrogenous 

 substance, is from 64 lbs. to 152 lbs. In the non-nitrogenous, or 

 total organic substance, required to produce a given amount of 

 increase, the range of variation in the highest amount is, there- 

 fore, only about 25 per cent, above the lowest ; but in the amounts 

 of the nitrogenous substance, the range of the highest above the 

 lowest is nearly 140 per cent. Looking to the figures a little 

 more closely, we see, that in the second set of four pens in this 

 Second Series, where the amount of nitrogenous substance in the 

 food was on the average only about half as much as in the first 

 set of four pens, there was at the same time, on the average, a 

 little more non-nitrogenous substance, consumed to produce a 

 given result. In these four pens of the second set, however — 

 with their comparatively low amount of nitrogenous substance — 

 we have an average of about 50 lbs. less, of total dry organic 

 matter, consumed to produce 100 lbs. of increase, than in the 

 pens 1 to 4, where it consisted in so much larger a proportion 

 of nitrogenous substance. Nor, will any one practically 

 acquainted with pig feeding doubt, that the pigs in pens 5 to 8, 

 where the food consisted in such very large proportion of Barley- 

 meal, would progress more favourably as to the quality of their 

 increase, or, that they would contain a larger proportion of fat, 

 and, consequently, more of dry substance, than those upon the 

 chiefly Bean and Lentil dietaries of pens 1 to 4. The coincidence, 

 too, in the amount of total dry organic matter, consumed to pro- 

 duce 100 lbs. of increase, in the four pens where the Barley-meal, 

 with its low supply of nitrogenous substance predominated, is 

 very striking ; and especially in three of them, it being in these 

 respectively 449 lbs., 443i lbs., and 444f lbs. ; and, it was in 

 these three pens, that the supply of nitrogenous substance was 

 about the lowest in the Series. Again, in three of the pens in 

 the first set of four, with the nitrogenous substance generally 

 double that of the three last alluded to, we have also nearly as 

 close a coincidence in the amounts of total dry substance con- 

 sumed ; though, as Ave have before noticed, it was here about 

 50 lbs. more than in the former. Thus, the amounts consumed 

 to produce 100 lbs. of increase in the three pens with the, 

 highly nitrogenous food, are respectively 511^ lbs., 499 i lbs.,, 

 and 503 lbs. ; instead of, as in the three former, only about 

 345 lbs. 



The fact, that a generally larger amount of total dry organic 

 matter, is required to produce a given amount of increase, the 



VOL. XIV. v> 



