the line of their respective callings. Our post office
department permits the transmission of books through the mails at very
small cost. A comprehensive catalogue of useful books by different
authors, on more than fifty different subjects, has recently been
published, for free circulation, at the office of this paper. Subjects
classified with names of authors. Persons desiring a copy have only to
ask for it, and it will be mailed to them. Address

MUNN & CO., 361 BROADWAY, NEW YORK.

* * * * *

PATENTS!

MESSRS. MUNN & CO., in connection with the publication of the
SCIENTIFIC AMERICAN, continue to examine improvements, and to act as
Solicitors of Patents for Inventors.

In this line of business they have had _forty-five years' experience_,
and now have _unequaled facilities_ for the preparation of Patent
Drawings, Specifications, and the prosecution of Applications for
Patents in the United States, Canada, and Foreign Countries. Messrs.
Munn & Co. also attend to the preparation of Caveats, Copyrights for
Books, Labels, Reissues, Assignments, and Reports on Infringements of
Patents. All business intrusted to them is done with special care and
promptness, on very reasonable terms.

A pamphlet sent free of charge, on application, containing full
information about Patents and how to procure them; directions
concerning Labels, Copyrights, Designs, Patents, Appeals, Reissues,
Infringements, Assignments, Rejected Cases, Hints on the Sale of
Patents, etc.

We also send, _free of charge_, a Synopsis of Foreign Patent Laws,
showing the cost and method of securing patents in all the principal
countries of the world.

MUNN & CO., SOLICITORS OF PATENTS,
361 Broadway, New York.

BRANCH OFFICES.--No. 622 and 624 F Street, Pacific Building, near 7th
Street, Washington, D.C.

End of the Project Gutenberg EBook of Scientific American Supplement, No.
841, February 13, 1892, by Various

*** END OF THIS PROJECT GUTENBERG EBOOK SCIENTIFIC AMERICAN ***

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