M.M. CO., 131 Milk St., Boston, Mass.

* * * * *

AGENTS TO CONTROL TERRITORY,

West and South (New England States, Connecticut excepted, taken), for
the sale of the "Eureka Button Fasteners," Patented 1876. No tool
required to put them on. Samples, &c., free. W.L. URANN, M'f'r, 21
Fulton St., New York.

* * * * *

ENGINES AND BOILERS.

New and complete. One 2-horse power, $140: 3 H.P., $175; 5H. P., $250;
10 H.P., $500; 25 H.P., $1,000; all sizes in proportion. Patterns,
drawings and models best and cheapest of any. Address POND 187 Grand
St. N.Y.

* * * * *

_Founded by Mathew Carey, 1785._

BAIRD'S SCIENTIFIC BOOK CATALOGUES NOW READY, NEW REVISED EDITIONS.

Of our valuable SCIENTIFIC BOOK CATALOGUES, which will be sent by mail
gratis, and free of postage, on application.

We are now receiving and keeping in stock the most important ENGLISH
AND AMERICAN SCIENTIFIC BOOKS as they are published, and are prepared
to furnish them or to give information in regard to all American and
Foreign publications in this department of literature.

HENRY CAREY BAIRD & CO.,

Industrial Publishers, Booksellers & Importers, _810 Walnut Street,
Philadelphia._

* * * * *

AIR COMPRESSORS FOR ALL PURPOSES.

_A SPECIALTY of HEAVY PRESSURES._

THE NORWALK IRON WORKS CO., SOUTH NORWALK, CONN.

* * * * *

OTIS' SAFETY HOISTING MACHINERY.

OTIS BROS. & CO., No. 348 Broadway, New York.

* * * * *

WROUGHT IRON

_Beams and Girders_

THE UNION IRON MILLS, Pittsburgh, Pa., Manufacturers of improved
wrought iron Beams and Girders (patented).

The great fall which has taken place in the prices of Iron and
especially in Beams used in the construction of FIRE PROOF BUILDINGS,
induces us to call the special attention of Engineers, Architects, and
Builders to the undoubted advantages of now erecting Fire Proof
structures; and by reference to pages 52 & 54 of our Book of
Sections--which will be sent on application to those contemplating the
erection of fire proof buildings--THE COST CAN BE ACCURATELY
CALCULATED, the cost of Insurance avoided, and the serious losses and
interruption to business caused by fire; these and like considerations
fully justify any additional first cost. It is believed, that were
owners fully aware of