Carriages and Slides of the Spanish Gunboats Designed by Captain Ericsson

Manufacture of Cotton Seed and Cotton Seed Oil

On the Uses of Zinc

On Ox Gall

Aniline Green for Wool

Preservation of Ice

The Preservation of Meat

Improved Bedstead and Mattress for Invalids

Improved Clothes Dryer

More about Niin

The Hydrostatic Test for Steam Boilers

Penny's Improved Gang Sawmill

Improvement in Key-Hole Guards

Six-Way Tap for Gas and Water

The Pneumatic Tunnel under Broadway, New York

Proposed Modification of the Patent Laws—An Attempt to Break Down the Right of Appeal

Official Report of Professor Chandler to the Board of Health on the New York Gas Companies

What is Chemistry?

Bent, Stained, and Ornamental Window Glass

Curious Ice Formations

Award of our Cash Prizes

Recent American and Foreign Patents- February 19, 1870

Answers to Correspondents- February 19, 1870

Official List of Patents- February 19, 1870

Issued by the United States Patent Office. FOR THE WEEK ENDING FEB. 8 ,1870. Reported Officially for the Scientific American.

Applications for Extension of Patents- February 19, 1870