l 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 author. 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.

In connection with the Scientific American, Messrs. MUNN & Co. are
solicitors of American and Foreign Patents, have had 42 years'
experience, and now have the largest establishment in the world.
Patents are obtained on the best terms.

A special notice is made in the Scientific American of all inventions
patented through this Agency, with the name and residence of the
Patentee. By the immense circulation thus given, public attention is
directed to the merits of the new patent, and sales or introduction
often easily effected.

Any person who has made a new discovery or invention can ascertain,
free of charge, whether a patent can probably be obtained, by writing
to MUNN & Co.

We also send free our Hand Book about the Patent Laws, Patents,
Caveats, Trade Marks, their costs and how procured. Address

MUNN & CO.,
361 BROADWAY, NEW YORK.
BRANCH OFFICE, 622 AND 624 F ST., WASHINGTON, D.C.

End of the Project Gutenberg EBook of Scientific American Supplement, No.
795, March 28, 1891, by Various

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

***** This file should be named 13443.txt or 13443.zip *****
This and all associated files of various formats will be found in:
http://www.gutenberg.net/1/3/4/4/13443/

Produced by Don Kretz, Juliet Sutherland, Victoria Woosley and the
Online Distributed Proofreading Team.

Updated editions will replace the previous one--the old editions
will be renamed.

Creating the works from public domain print editions means that no
one owns a United States copyright in these works, so the Foundation
(and you!) can copy and distribute it in the United States without
permission and without paying copyright royalties. Special rules,
set forth in the General Terms of Use part of this license, apply to
copying and distributing Project Gutenberg-tm electronic works to
protect the PROJECT GUTENBERG-tm concept and trademark. Project
Gutenberg is a registered trademark, and may not be used if you
charge for the eBooks, unless you receive