This historic book may have numerous typos, missing text or index.
Purchasers can download a free scanned copy of the original book
(without typos) from the publisher. 1806. Not illustrated. Excerpt:
... thust perhaps be ultimately referred to the changes of
capacity* as ascertained by experiment. c. (ft. 85. J No part of
the doctrines which Berthollet has advanced is more important than
what relates to the influence of external circumstances on the
exertion of affinity. They are comprehended under the general
proposition, that affinity is not an uniform force, varying merely
in its intensity, as exerted by different substances, but that it
is much modified by several causes, chiefly by Quantity of Matter,
Cohesion, and Elasticity. Of these, quantity of matter h
undoubtedly the most important, since it influences so much trie
operation of the others, and the doctrine with regard to it affords
several important corollaries. The following are a few of the facts
referred to in the text, as those by which the truth of-the
principle Berthollet has advanced, that quantity of matter within
the sphere of action adds to the force of the aflinity which that
matter exerts, is established. " I have kept," says he, " an equal
quantity of potash, and of sulphate of barytes, in a small quantity
of boiling water. The potash had been prepared by alkohol, and
contained no carbonic acid: the same served for the following
experiments. The operation was performed in a retort, and
consequently in communication with the air; and it was continued
until the mixture was desiccated: the residue was washed with
alkohol, which dissolved' the potash, and after that with water,
which also produced an alkaline solution, the alkali of which I
saturated with acetic acid; after which, by evaporation, the
solution yielded crystals, possessing all the characters and
qualities of the sulphate of potash. Whence it appears, that the
sulphate of barytes was partially decomposed by the potash, and
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