25 lb.
Real attenuation per barrel, 13 lb. 8 oz.
Yest and lees, 5 8
--------
19 lb.
Gravity per barrel, when transparent, 6
--- 25 lb.

It may be said that nineteen pounds is the real attenuation, and the
yest and lees produced is part thereof, as the fluid, or beer, in a
state of transparency is but six pounds per barrel specific gravity,
and it may, in some degree, be allowed to be so, as there is really so
much gravity lost during the process of fermentation. If we multiply
thirteen pounds eight ounces, which I have called the real attenuation,
by four, we shall find the result to be fifty-four pounds, which is
nineteen pounds more of superfluous gas upon four barrels of worts, of
twenty-five pounds gravity each, than is extricated from an equivalent
quantity of saccharine matter; that is, from one hundred pounds of raw
sugar or one hundred and twelve pounds of molasses, and their
respective waters of dilution, when the yest and lees do not exceed
five pounds eight ounces per barrel. This may be truly called an
analysis of the fermentable matter, giving the component parts
tolerably exact; though much depends on the management of the
fermentation, and the subsequent cleansing. By this analysis it
appears, that the mucilage of malt, or grain, gives out more gas than
the mucilage of sugar; and leaves a doubt on the mind whether to
adjudge the superfluous gas to the fermentable matter, or to the water
of dilution, or partly to both; but so it is, that these are the
products, whatever source we derive them from, and there is no denying
facts. The yest first added is not brought into this account.

There is a great similarity of appearance between the two species of
low combustion, fermentation and respiration. Fermentation, like
respiration, is the spontaneous effort of involuntary motion to
decomposition; and in the fermenting mass, as in the animal system, it
raises the temperature of both above that of the surrounding
atmosphere: that is, it is the cause of heat and involuntary motion,
both in the fermenting mass and in the animal system; and, like slow
combustion, consumes both, and resolves them into their first
principles, from which tendency the lat