o22 



Ar/ricultural Chemistry. — Pi(j Feedimj. 



than to those of the nitrogenous ones. The results of the expe- 

 riments with Pigs, as given in the six Tables now about to be 

 considered, will be found fully to bear out the same conclusions 

 which those on Sheep seemed to indicate — namely, that, as our 

 current fattening food-stuffs go, both the amount consumed by a 

 given weight of animal, within a given time, and that required 

 to produce a given amount of increase, bear a much closer 

 relationship to the amounts in the food, of the available non~ 

 nitrogenons constituents, tlian to those of the nitroj^enous ones. 



Turninf^ now to the Tables themselves fXXII., XXIII., 

 XXIV., XXV., XXVI., and XXVII.), we shall find, that the 

 columns of total dry organic matter, of nitrogenous substance, 

 and of total non-nitrogenous substance, as given in Division 2 of 

 each of them, will illustrate the points in question. A glance 

 at the total columns for these three classes of constituents, 

 throughout the Tables for the three Series as a whole, will show, 

 that in all comparable cases, there is very much more of uni- 

 formity, in the columns of the total organic matter^ or of the total 

 mn-nitrofjenous substance, than in those of the nitrogenous sub- 

 stance — both in Tables XXII, XXIII., and XXIV., which give 

 the amounts consumed weekly -per 100 Ihs. live weight of animal, 

 and in Tables XXV., XXVI., and XXVII., which give the 

 amounts consumed to produce 100 lbs. of increase.^ 



Some of the deviations from this general regularity in the 

 amounts of non-nitrogenous, or of total organic substance con- 

 sumed, clearly show when examined into, that the uniformity 

 would be even more strict, if the amounts, only of the really 

 digestible or available respiratory and fat-forming constituents 

 could have been represented, instead of, as in these Tables, that 

 of the gross or total organic or non-nitrogenous substance con- 

 sumed ; and this is more particularly the case in those Tables 

 which show the amount consumed to produce a given weight of 

 increase. 



Thus, in reading the figures of the Tables, allowance has to 

 be made, both for those of the non-nitrogenous constituents of 

 the food, which would probably become at once effete, and also 

 for tiie different respiratory and fat-forming capacities., so to 

 speak, of those portions of the food which are digestible and 

 available for the purposes of the animal economy. For, it 

 will be remembered — that the Bran, which was given in such 

 large quantities in some cases, contains a large quantity of 

 indigestible and unnutritious, and consequently effete woody 

 fibre — that it must require as much as from twice to thrice 

 as much of the starchy series of compounds, as of the fatty 



* See also the Diagrams. 



