Colors of the Sea

Improved Excavator

Tilghman's Process of Cutting Hard Substances

Something about Seeds

Cochineal Insects and their Allies

Molding and Mixing Machines, used by the Union Stone Company--The Sorel Process of Manufacturing Artificial Stone

Mortar Light

Cope & Maxwell's Upright Boiler Feeder

Roofs and Roofing

Canal Navigation

Proposed Changes in the British Patent Laws

Mining Schools in the United States

Uses of Infusorial Silica

Scientific Intelligence- April 29, 1871

Carbolic Acid

Editorial Summary

Queries- April 29, 1871

Answers to Correspondents- April 29, 1871

Recent American and Foreign Patents- April 29, 1871

Applications for Extension of Patents- April 29, 1871

Official Lists of Patents- April 29, 1871

Issued by the U. S. Patent Office