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.