340 REPORT—1852. 
that one of the pigs in this pen was unwell in the same way as those referred 
to in the previous pens during a considerable portion of the period of the 
experiment, we might have assumed perhaps, that the results of this pen would 
have pointed to the proportions of the several foods best adapted to the wants 
of the animals; and if such a conclusion were a legitimate one, it would 
indeed appear, that their natural demands called for a larger proportion of 
nitrogen than was within the reach of the animals in any of those pens in 
which Indian meal was the ad libitum or complementary food. ‘Two of the 
pigs, however, in this pen 12, increased exceedingly well, and gave eventually 
the highest proportion of carcass to live weight, of any in this entire series of 
experiments. It is, too, an interesting fact, that as the experiment proceeded, 
and the animals matured, their consumption diminished very considerably. 
Thus, the proportion of the bean and lentil mixture to the total food consumed 
was only two-thirds as great at the conclusion as at the commencement of 
the experiment, whilst that of the Indian meal was not three-fifths as much 
at the commencement as at the conclusion. We have in this fact some indi- 
cation of the large proportion of the nen-nitrogenous constituents of the food 
which is appropriated by the fatting animal. 
Reviewing, as a whole, the reults of these twelve dietaries, and carefully 
considering the bearing of the various circumstances which must influence 
our reading of the actual figures of the Table relating to them, we think it 
cannot be doubted, that here, as in the case of the sheep, we have very clear 
evidence that it is the non-nitrogenous, rather than the nitrogenous consti- 
tuents of the food, that have fixed the limit to consumption. 
In the lower section of this Table VI., we have the results bearing upon the 
same point, of a second series of experiments with pigs, conducted on a 
similar plan to that of the former one. In this second series of pig experi- 
ments, we have, as before, the bean and lentil mixture as the highly nitro- 
genous food. Barley meal is in this case used as the non-nitrogenous food, 
instead of Indian corn as in the former series. Bran, again, constitutes the 
third food. In this series however, when either the bean and lentil mixture, 
or the barley meal, constituted the limited food, the daily allowance per head 
was 3 lbs. instead of 2, as in the former series. When the limited food was 
bran, 1lb. only, instead of 2 as previously, was now given. In other respects, 
excepting that in this series bran was in no case given alone as the ad libitum 
food, the arrangements were the same as in the case of the previous series. 
The weather during part of the period of this second series of experiments 
was exceedingly hot; from this several of the animals suffered considerably ; 
and some, either from this or other causes, became quite ill and died, or were 
“killed to save their lives.” Nevertheless it is seen, that there was, upon the 
whole, a larger amount of respiratory food consumed in relation to weight in 
this series than in the previous one during the cooler season. 
If we compare the column of the amounts of non-nitrogenous constituents 
consumed weekly, per 100 lbs. live weight of animal, for this series, as given 
in the lower section of Table VI., with that in the upper section for Series 1, 
we shall see that there was, upon the whole, a greater uniformity inthe former 
than in the latter. ‘There are, however, one or two marked exceptions to the 
regularity of amount of non-nitrogenous matter consumed in this Series 2, 
which, but for coincident circumstances, and the abundance we have of evi- 
dence in the opposite direction, might lead to different conclusions than those 
which we have drawn from the results as a whole; but at any rate the uni- 
formity is still greater here than in the column of the nitrogenous substances. 
The more obvious exceptions to the rule are pens 1 and 8; but apart from 
any incidental eauses which might account for these—and in each of these 

