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Features

A New Amalgamator

Improved Switch Signal and Alarm

Science Familiarly Illustrated

Business and Manufacturing Items

Paris Exposition--The Chaotic Stage

Editorial Summary

Steam Boilers--Their Form, Construction, and Material

Gleanings from the Polytechnic Association

The Tricks of the Alchemists

Breakage of Car Wheels--The Causes and Remedies

Lipp's Ice Cream Freezer

The Golden Hegira

Answers to Correspondents

Recent American and Foreign Patents

What is the Theory of the Water Polish?

Our Street Pavements

The Dangers of Our Artificial Lights

Caution

Phonography and Photo-Phonography

Are Our Coal Fields Inexhaustible?

Extension Notices

American Exhibitors at the Paris Exposition

Patent Claims

Fay's Roofing, Flooring and Weather-Boarding Paper

How to Obtain Patents

Custer's Improved Toe Calk for Horses' Shoes

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May 04, 1867

Beyond XX and XY

Biology. Identity. Equality.