FEEDING OF ANIMALS. 311 



per cent. What proportion, however, of the two-thirds of 

 the total nitrogenous substance of clover -hay, which is 

 estimated to be digestible, will probably be non-albuminoid, 

 there is no evidence to show. Under these circumstances we 

 have, in the calculations, assumed the whole of the digestible 

 nitrogenous substance of clover-hay to have the food-value of 

 albuminoids. The figures will, therefore, doubtless overstate 

 the amount of the nitrogenous substance consumed in the 

 fixed foods, which is really available for nitrogenous increase 

 and for fat-formation. 



Taking the figures as they stand, it is seen that, after 

 deducting the amount of nitrogenous substance estimated to 

 be stored up in 100 of increase from the amount supplied in 

 the fixed food, there remain in the several experiments 44.9, 

 43.6, 48.3, 48.4, and 51.1 parts, possibly available for fat- 

 formation. 



Then deducting the amount of digestible fat in the total 

 food from the fat estimated to be stored up in the increase, 

 there remain — 55.9, 56.1, 56.0, 55.7, and 55.2 parts, which 

 must have been newly - formed. Deducting from these 

 amounts those producible from the available nitrogenous 

 substance of the fixed foods, there remain — 32.8, 33.7, 31.2, 

 30.8, and 28.9 parts, to be formed from other sources. Com- 

 paring with these amounts those derivable from the nitro- 

 genous substance of the roots, assuming, as shown in the 

 bottom line of the table, that the whole of it would have the 

 same value for fat-formation as true albuminoids, it is seen 

 that in four out of the five cases the fat so assumed to be 

 formed would be less than that required. 



In these experiments the roots consisted chiefly of Swedish Nitrogen 

 turnips, and in only small proportion of mangels. The evidence m swedes - 

 at command leads to the conclusion that, in Swedish turnips 

 a larger proportion of the total nitrogen exists* as albuminoids, 

 and a less proportion as nitrates, than in the more succulent 

 mangels. We have found the proportion of the total nitrogen 

 of Swedish turnips existing as albuminoids as low as 32.9, 

 and as high as 55.8 ; and for the purposes of calculation we 

 assume that, on the average, 45 per cent will be in that form. 

 As large or a larger amount will, however, exist as amides 

 than in mangels. 



It is evident, therefore, that even if we assume 50 per cent 

 of the total nitrogenous substance of the roots consumed in 

 this second series of experiments to have been of value for 

 fat-formation, some amide will be included. But, even on 

 the assumption that 50 per cent had the value of albuminoids 

 for fat-formation, less than half the amount of fat required 

 would be derivable from the nitrogenous substance of the 



