Agricultural Chemistry. — Pig Feeding. 



533 



to produce a given amount of gross increase, may vary very 

 greatly, the range being, in fact, in this Series II., in the propor- 

 tion of from 1 to nearly 2i. 



Turning now to a consideration of the same particulars for the 

 Third Series, as given in Table XXVIL — it will be remembered, 

 that the food in this Series contained a large amount of the 

 highly nitrogenous Cod-fish ; and also, that in this Series there 

 was, in the iceekly consumption hy a given weight of animal^ a less 

 range from the minimum, of either class of constituents, but 

 especially of the nitrogenous ones, than in either of the other 

 Series. In this Table XXVII., too, showing the amounts of con- 

 stituents consumed in this Series, to produce a given amount of 

 increase^ we have also a less range in both classes of constituents 

 than in the Series I. and II. Still, even here, the range in the 

 amounts of nitrogenous substance, consumed to produce a given 

 amount of increase, is somewhat greater, than that of either the 

 pure non-nitrogenous, or the total organic substance. The smallest 

 amounts, both of ?zo72-nitrogenous and of total organic substance, 

 consumed to produce a given amount of increase, in this Series, 

 are in pen 2 ; in -which the amounts of the nitrogenous substance 

 also was the least. And again, the largest amount of non- 

 nitrogenous, or of total organic substance required, were in 

 pen 3, where there was at the same time, the largest supply of 

 the nitrogenous substances. The smallest amount of total dry 

 organic substance, required to produce a given amount of increase, 

 throughout the three Series indeed, was in the pen 2 of this Third 

 Series ; and it was here, that the food contained a less proportion 

 of indigestible effete matter, than in any other pen in the three 

 Series, whilst at the same time, it had a higher respiratory and 

 fat-forming capacity, and a large proportion of previously ani- 

 malized protein compounds. With the exception of this pen 2, 

 in w4iich the food was of such concentrated flesh-forming, fat- 

 forming, and respiratory capacity, the amounts of non-nitrogenous, 

 and of total organic substance, consumed to produce a given 

 amount of increase throughout the Third Series, agree very closely; 

 and the amounts in this Series also correspond very closely with 

 those in the Series I. and II. Whilst, however, in the four pens 

 of Series III., now compared together, the amounts of non-nitro- 

 genous, or of total organic substance, consumed to produce a 

 given result, vary only about 10 per cent, in the highest above 

 the lowest — those of the nitrogenous substance in the same pens, 

 varied about 30 per cent. 



Upon the whole, then, although the results of this Series, with 

 the unusual food of Cod-fish, show less strikingly than those of 

 the former ones, the closer connection of the non-nitrogenous, 

 than of the nitrogenous constituents consumed, with the amount 



2 N 2 



