anil of their Increase whilst Fattening. 
467 
much as in Class I. Having regard to these circumstances, the 
composition of the original weights of the sheep of Classes III. 
and IV. is taken at the mean between that of the " store " and 
that of the " fat sheep " analysed ; and that of their final weights 
at that of the "fat sheep" itself. 
From considerations of a similar nature, in Class V., the ori- 
ginal weights are taken at a composition two-thirds advanced from 
that of the "store" to that of the "fat sheep" analysed. The final 
weights are taken at the composition of the analysed " fat sheep." 
The percentage of carcass in fasted live-jvei(/ht, as given in the 
Table, shows pretty well the comparative ^maZ condition of the 
respective lots ; and this was obviously not widely different in 
Classes I., III., IV., and V. 
It must not be supposed that the differences which the figures 
show in the estimated composition of the increase of the different 
sets of animals within one and the same Class, may really be 
taken as representing the variations in composition attributable 
to the variations in breed, food, cScc. All that can be claimed 
is, that the results as a whole give the best indications of the 
composition of the increase of fattening sheep at present at com- 
mand, and that they pretty fairly represent the differences 
between Class and Class. 
From the figures in the Table, it would appear that the in- 
crease of the fattening sheep contained from 2 to 3 per cent, 
of mineral matter. Either of these estimates is, however, un- 
doubtedly too high. The error is due to the fact that there was 
a quantity of dirt in the wool, which added considerably to the 
weight of its ash ; and it happened to be the greater in that of 
the fatter animals. Excluding altogether from the calculations 
the ash of the wool, the percentage of mineral matter in the 
increase of these fattening sheep would appear to be certainly 
under 2, and sometimes under H, per cent. 
In the increase of the fattening sheeji the average estimate of 
nitrogenous compounds is 7 "IS, of fat 7()'4, and of total dry sub- 
stance 79"9 per cent. Thus the calculations show a rather less 
percentage of nitrogenous compounds, and a rather higher one 
of both fat and total dry substance, in the increase of the fatten- 
ing sheep than in that of the oxen. It would be expected that, 
under comparable conditions, such would be the case. 
The composition of the increase from the store to the fat con- 
dition of the analysed fat pig (see top of Table XV.) shows 
0'53 per cent, mineral matter, 7"76 per cent, nitrogenous com- 
pounds, 63"1 per cent, of fat, and in all 71 '4 per cent, of total 
dry substance. 
Against these numbers, which undoubtedly represent the truth 
vei-y closely for the particular animal to which they refer, the 
