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506 5664m V. 2

art. I

PHILADELPHIA:

COLLINS, PRINTER, 705 JAYNE STREET.

PREFACE.

THE following Report has been prepared under the direction and at the expense of the Smithsonian Institution, from articles in various Journals of Science and the Arts, published during the last few years, in the English, French, and German languages; and, among these, we acknowledge our indebtedness chiefly to the Chemical Gazette, issued in London, and to the excellent Report on Practical Chemistry, by Dr. Elsner, of Berlin. We have freely exercised discrimination in the selection of subjects, and have omitted much that we found on Applied Chemistry, because novel views need in many cases further confirmation to render them reliable in practice, and, if presented too early to the artisan, may be productive of more evil than good. We have kept in view the benefit of the practical man, the manufacturer or maker, and, while we have not avoided scientific terms when more convenient, we have generally used modes of description intelligible to every one.

American Patents relating to the Chemical Arts have been generally omitted, because they are published annually in the Reports of the Patent Office, which are widely distributed throughout the United States, and therefore accessible to all..

We have confined ourselves to such foreign improvements in the Chemical Arts, whether patented or not, as we believed the American artisan might avail himself of, frequently offering critical remarks on them, and sometimes pointing out where improvements were likely to be made.

We trust that the work will prove useful to that portion of the public more exclusively interested in the arts, and not less acceptable to men of science, as exhibiting the contemporaneous advancement of science and art. J. C. B. and C. M.

PHILADELPHIA, JULY, 1851.

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