The Theory and Practice of BrewingCombrune, Michael
Science
The Theory and Practice of Brewing
Combrune, Michael
Brewing
Malt dried in so low a degree, as that the vegetative power is not
entirely destroyed, on laying together in a heap, will generate a
considerable degree of heat, germinate afresh, and send forth its
plume or acrospire quite green. The ultimate parts of the nourishing
principles are then within each other’s power of acting, else this
regermination could not take place; and such grain cannot be said
to be malted, or in a preservative state. Bodies, whose particles
are removed, by heat, beyond their sphere of attraction, can no more
germinate; but, coming in contact with other bodies, as malt with
water, they effervesce. The grain we are now speaking of first shews
this act of effervescence, when it has been thoroughly impressed with
a heat of 120 degrees, and a little before its color, from a white,
begins to incline to the yellow. Such are the malts, which are cured in
a manner to be able to maintain themselves sound, though in this state,
and at this degree of dryness, they possess as much air, and as many
acid and watery particles, as their present denomination can admit of.
This therefore may be termed the first or lowest degree of drying this
grain for malt.
To discover the last or greatest degree of heat it is capable of
enduring, the circumstance to guide us to it, though equally true, is
not so near at hand as effervescence, which helped us to the first. We
must therefore have recourse to the observation of that heat, which
wholly deprives the grain of its principal virtues. Dr. Shaw observes,
_alcohol is one of the most essential parts of wine_; when absent, the
wine loses its nature, and, when properly diffused, it is a certain
remedy for most diseases incident to wines, and keeps them sound and
free from corruption; from whence was derived the method of preserving
vegetable and animal substances.—The same excellent author had before
this observed, that _no subjects but those of the vegetable kingdom
are found to produce this preserving spirit_. Is alcohol, then, a new
body, created by fermentation and distillation; or did it originally,
though latently, reside in the vegetable? _I have for a good while been
satisfied, by experiments_, says Boerhaave, _that all other inflammable
bodies are so only as they contain alcohol in them, or, at least,
something that, on account of its fineness, is exceedingly like it; the
grosser parts thereof, that are left behind, after a separation of this
subtile one, being no longer combustible_.
Public-domain text, read in full here on John Shaqi.
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