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THE

SCIENTIFIC AMERICAN SUPPLEMENT.

PUBLISHED WEEKLY.

TERMS OF SUBSCRIPTION, $5 A YEAR.

Sent by mail, postage prepaid, to subscribers in any part of the
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All the back numbers of THE SUPPLEMENT, from the commencement, January
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COMBINED RATES.--One copy of SCIENTIFIC AMERICAN and one copy of
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A liberal discount to booksellers, news agents, and canvassers.

MUNN & CO., PUBLISHERS
361 Broadway, New York, N.Y.

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USEFUL ENGINEERING BOOKS

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MUNN & CO., 361 BROADWAY, NEW YORK.

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PATENTS!

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In this line of business they have had _forty-five years' experience_,
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