and of their Increase wliilst FattcniiKj. 
Alb 
animals. It is obvious, therefore, tliat there was ;i formation of 
fat in tlie body from some otlier constituent or constituents of 
the food. To this point we shall recur presently. 
2. Amounts of Mineral Matter, Nitroc/enons Compounds, Fat, and 
total Dry Substance stored up in Increase — and of matter 
expired, perspired, or voided — for 100 of total dry substance 
consumed in food. 
The results under this head arc given in Table XIX. for the 
different sets of sheep, and in Table XX. for the different sets of 
piys. 
It has been already seen that, in the case of the sheep, there 
was probably an average of about 9 parts dry substance fixed in 
increase for 100 of dry substance consumed in the fattening 
food. Taking the cases in which the food was of the most 
usual description, Table XIX. shows, that with about 9 parts 
total dry increase, about 8 were non-nitrogenous substance — that 
is, fat. It results that for 100 total dry substance of food, there 
would be little more than 1 part fixed in increase as nitrogenous 
and mineral matters put together. Of this, making due allow- 
ance for the error in the estimates arising from the dirt in the 
wool, there would, on the average of the cases, be only about 0"2 
of mineral matter. 
Assuming 9 parts of dry increase to be the produce of 100 
parts of dry substance of food, v/hen sheep are liberally fed for 
the butcher, there would of course be 91 parts expired, perspired, 
or voided. 
In the case of the analysed fat pig, 100 parts of dry substance 
of food produced 14*94 parts of dry increase. Of this, 13'2 were 
fat, 1'62 nitrogenous compounds, and 041 mineral matter. From 
the circumstances of this experiment it may be concluded that 
these figures very closely represent the actual facts. 
Against these numbers, the average of all the other estimates 
relating to pigs — 24 in number, and comprising 80 animals — • 
indicates, 17'27 total dry increase for 100 total dry food ; of which 
15'81 are estimated as fat, 1'44 nitrogenous substance, and an 
insignificant amount mineral matter. It is admitted that the 
tabulated estimates of the mineral matter assimilated by sheep 
are too high, and that those relating to pigs are probably in error 
in the opposite direction. 
Pigs, even when young, if put upon highly-fattening food, will 
grow comparatively little in frame ; whilst sheep, fattened as 
they now generally are at a comparatively early age, will, com- 
pared with the pig, develop more of hard bony structure. The 
percentage of mineral matter in the carcass of the fat sheep ana- 
lysed was very much higher than in that of the analysed fat pig. 
■VOL. XXI. 2 K In 
