536 ME. J. B. LAWES DR. J. H. aiLBEET ON THE COMPOSITION OE 
calculations the ash of the wool, the percentage of mineral matter m the mcrease 
would appear to be certainly under 2, and sometimes imder per cent., for the cases 
of the fattening Sheep given in the Table. . . . , 
The average estimated percentage of nitrogenous compounds m the mcrease of the 
fattening Bullocks, is 7-69 ; that for the fattening Sheep is, as would be expected, 
somewhat less, namely, 7T3. The average estimated percentage of /ufm the mcrease 
of the Oxen is 66-2 ; whilst that in the Sheep is 70-4. The direction of the difference 
is here again, that which would be anticipated. Finally, the estimated percentage o 
total dry substance in the mcrease of the Oxen, was 75-4; and that for the Sheep, was 
79-9. Granting that the estimates for the composition of the mcrease of the Sheep, hke 
those for that of the Oxen, are more probably too high than too low, stiB there cm e 
little doubt, that, under at all comparable conditions, the mcrease of the fatten^ S eep 
would contain a somewhat less proportion of nitrogenous matter, and a somewhat larger 
one of both fat and total dry substance, than that of Oxen. On the other han(k common 
observation would lead to the supposition, that the mcrease of the fattening Pig woidd 
be less nitrogenous, and contain both more fat and more total diy substance, than that 
of the Sheep. . . . . . ^ ^ . 
In Table X. are given the calculated estimates of the composition of the increas 
about eighty fatteuing Kgs-divided into lots of three, four, or sLx animals each The 
composition of the increase of the analysed “ fat Pig” (given at the top of the Table lor 
the sake of comparison with the other estimates), shows 0-53 • per cent, of inmera. 
matter, 7'76 per cent, of nitrogenous compounds, 63T per cent, of fat, and in a , i 
per cent, of total dry substance. Against these numbers, which undoubtedly represent 
the truth very closely for the particular case in question, the average of all the ot ler 
estimates in the Table gives 0-06 per cent, of mineral matter, 644 per cent, of nitro- 
genous compounds, 71-5 per cent, of fat, and 78-0 per cent, of total dry substance. 
We have then, in the average of the estimated composition of the mcrease of the^e 
numerous fattening Pigs, rather less mineral matter and nitrogenous compounds am 
several per cent, more fat and total dry substance, than in that of the single analysed 
“ fat Pig ” Most of the animals, the composition of whose increase is thus estimated, 
were, however, in a somewhat further advanced condition, both at the commencement and , 
the conclusion of the experiment, than the single analysed “ fat Pig.” Some evidence ol 
this is to be found in the relation of the “ original” weights, and of the percentages Oj ; 
carcass in fasted live-weight, as recorded in the Table. It would theieloie in aU pn 
bability be really the case, that in the average of the instances brought under the calcu- | 
lation, the increase would contain a less proportion of both mineral and mtiogenous i 
matter, and a larger one of both fat and total dry substance, than that of the sing e | 
* These figures are somewhat corrected from those given in the Report of the British Association foi t ^ j 
Advancement of Science for 1852, where the composition of the increase of this analysed “ iat pig is gn eij 
as follows -.-mineral matter OAS, nitrogen IBS (equal about S'SS nitrogenous compounds), 63-1 tat, 
71-8 total dry substance. 
