528 ME. .1. B, lA-WBS AND DB. J. H. GILBEET ON THE COMPOSITION OP 
of animal, to determine the composition of the increase from one condito to another- 
eupposing this to be represented by the difference in weight between the annual whrcn 
was^analysed in the lean, and that which was analysed in the fat condition it may be 
observed, that owing to the larger frame, and growing rather than fattei^g character, 
of the half-fat Ox analysed, compared with the fatter one, it approached so nearly the 
actual weight of the latter, as to indicate (if the difference in weight were alone taken 
as the measure) a very small amount of actual increase; whilst the difference m the 
composition of the two animals was very considerable. In fact, m the case suppose . 
the so-calculated total or gross increase would be less than the estimated gam m rg 
substan.ce of increase alme: that is to say, it would appear that there had been an 
actual displacement of water, and replacement of it by a corresponding amount of d^- 
substance. It may be said that the displacement of water, and the leplacement o i y 
fat, in the fattening animal, or in other words a greater increase m dry substance t an m 
the .ms lire^eigU, is not impossible. The consideration of the results relating to the 
Pies' as well as the tendency of observation, comparing ammals of this description with 
otters, would, however, militate against such an assumption. For sMar reasons to 
those alluded to in regard to the two BuUocks, the difference in weight between the 
Sheep analysed in the respective conditions of fatness, caimot be taken as representmg 
the amount of gross increase in weight in passing from the one standard condition to 
the other. Instead, therefore, of taking the live-weights of the mdividual ammals 
actually analysed, as the data upon which to calculate the composition of the mciease 
from one condition to another, it will be more appropriate to adopt the kno™ hie- 
weights of considerable numbers of animals, taken first in a store or lean, and afteiwai s 
in a fatter condition. , , , • r... 
So far as oscen are concerned, we take for our iUustrations the best experiments on 
record with which we are acquainted, that show, so far as can be 
comparable with that implied in the change from the condition of the ha a 
of the “fat Ox” analysed. ... * 
In regal'd to sheep, we take the data supplied by published experiments of oui o,™ . 
In some of these, considerable numbers of animals of different breeds were ^ “hO" 
similar food; whilst in others, animals otheiwise compai-able were fed upon different 
f ods 
° Lastly, the compositions of the store and of the fat pig analysed, have, respectively, 
been applied to the weights store, and the weights fat, of numbers of pigs fed expeii- 
mentally— the amounts of whose gross increase in live-weight, together mth “e paiti- 
culai's of the constituents consumed in food to produce it. have already been published 
elsewheref. For the sake of comparison, by the side of the estimates of the compo- 
• Journal of the Eojal Agricultural Society of England, vol. i. part 1 ; vol vu. part 2 ; vol. lui. part 1 , 
TL^I of^the Boyal Agricultural Society of England, vol. liv. pai-t 2 ; Eeporta of the British Asso- 
elation for the Advancement of Science, for 1852 and 1854<. 
