teresting ramifications, is more fully explained
by the learned professors in what is called the science of chemistry.

As plants of all descriptions, and their several parts, form a link of
that chain by which the welfare of the universe is connected, the
industry of mankind is excited to preserve them for the different
purposes to which they are applicable, in the oeconomy of human
existence, to whose use the greater part of the animal and vegetable
creation appears to be subservient. As men, then, and rational beings,
it becomes our duty so to manage those things, when necessary, as to
counteract as much as possible the decomposition and corruption which
are natural to all organized bodies when deprived of the living
principle.

We find that some vegetables are used fresh, but the greater part are
preserved in a dry state; in which, by proper management, they can be
kept for a considerable time afterwards, both for our own use as well as
for that of others who reside at a distance from the place of their
production.

In the preparation of the parts of plants for medicinal purposes, we
should always have in view the extreme volatility of many of those
substances, and how necessary it therefore is, that the mode of
preparation and drying should be done as quickly as possible, in order
to counteract the effects of the air and light, which continue to
dissipate, without intermission, these particles, during the whole time
that any vegetable, either fresh or dried, is left to its influence.

If we consider the nature of hops, which I shall take as an example, as
being prepared in this way on the largest scale, we shall find they
consist of three different principles; namely, an aroma, combined with
an agreeable bitter taste, and a yellow colour; all of which properties
are, by the consumers and dealers therein, expected to exist in the
article after drying.

The art of drying hops, therefore, has been a subject of speculation for
many years; and although we find the kiln apparatus for preserving them
differ in many places, from the various opinions of the projectors, yet
they are all intended for the same mode of action, i. e. the producing
of a proper degree of heat, which must be regulated according to the
state of the atmosphere at the gathering season, and the consequent
quantity of the watery extract that the hops contain at the time: thus
it is usual to have two kilns of different temperatures at work at the
s