in the quantity of carbonic acid expired during rest and active
exertion, is very large. The inference to be drawn from this is, that
when it is sought to fatten an animal rapidly, every effort must be made
to restrain muscular motion so far as compatible with health. Hence, the
peculiar advantage of stall-feeding, in which the animal is confined to
one spot, and the more thoroughly it can be kept still, the greater will
be the economy of food. This is gained by darkening the house, and
excluding all persons, except when their presence is indispensable.

An extension of the same principle has led to the use of food
artificially heated, but it is doubtful whether the advantages derived
from it are commensurate to the increased expense of the process; at
least opinions differ among the best informed practical men on this
subject.

Many other matters, besides these mentioned, exercise an important
influence on the feeding of stock, such as the general health of the
animal, the breed, etc. These are subjects, however, which bear more
directly on practical agriculture, and need not be discussed here.

The judicious feeder will not only give due weight to the principles
already discussed in all he does, but he must take into consideration
the extent to which they are liable to be modified in particular cases.
He must also attend to the cost of different kinds of food, and the
value of the manure produced by them, subjects of much importance in a
practical point of view, and which must influence him greatly in choice
of the particular substances he supplies to his cattle.

INDEX.

Acid, apocrenic, 21.
Carbonic, 10, 15, 20, 37, 57, 115.
Cerotic, 48.
Crenic, 21.
Geic, 21.
Hippuric, 168.
Humic, 21.
Lactic, 168.
Margaric, 47.
Nitric, 11, 17, 30, 33, 38, 62, 112.
Oleic, 47.
Pectic, 46.
Phosphoric, 73, 90.
Stearic, 47.
Sulphuric, 182, 237.
Ulmic, 21.
Uric, 168.

Adulteration of guano, 211.

Agricultural Chemistry Association of Scotland, 6.

Air, influence of, on germination, 55.
In the pores of soils, 115.

Albite, 86.

Albumen, 48.

Albuminous constituents of plants and animals, 48.

Algoa Bay guano, 208.

Alkaline salts, value of, 260.

Alumina, 73, 86, 103.

Ammonia, absorption of, by plants, 29, 38.
Absorption of, by soils, 123.
Carbonate of, 29.
Composition of, 12.
Decomposition of, by plants, 61.
Presence in dew, 17.
" rain,