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Features

Aniline Black

Beet Root Sugar

Bolling Mill Gearing

The Levering Patent Desk

Pratt's Elastic Boiler-Tube Scraper

Skinning and Stuffing of Small Quadrupeds

Burghardt's Improved Milk Can Stopple

The New York “Times” on Nitro-Glycerin

A Noble Inventor

Improvements in the Steam Engine

What is Pressure? and What Work Will It Accomplish?

King-Crabs and the Manufacture of Cancerine

Cultivation of Opium in the United States

New Type-Setting and Distributing Machine

How a Workingman May Get a House of his Own

New Publications

The Late Rev. Patrick Bell, LL.D

Editorial Summary

Recent American and Foreign Patents

Answers to Correspondents

Manufacturing, Mining, and Railroad Items

Official List of Patents

Applications for Extension of Patents

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June 05, 1869

Beyond XX and XY

Biology. Identity. Equality.