On the Determination of Manganese in Steel, Cast Iron,
Ferro-manganese, etc.

Manganese and its Uses.

Ozokerite or Earth-wax. By WILLIAM L. LAY. A valuable
and instructive paper read before the New York Academy of
Sciences.--Showing the nature, sources, and applications of this
remarkable product.

On the Constitution of the Natural Fats.

II. ENGINEERING AND MECHANICS.--Improved Spring wheel
Traction Engine.--With two engravings.

An Improved Iron Frame Gang Saw Mill.--With one large
engraving.

The Heat Regenerative System of Firing Gas Retorts.--Siemens'
principle.--As operated at the Glasgow Corporation Works.--With
two engravings.

A New Gas Heated Baker's Oven.

III. TECHNOLOGY.--How to Produce Permanent Photographic Pictures
on Terra Cotta, Glass, etc.--With recipes and full directions.

How to Make Paper Photo Negatives.--Full directions.

Some of the Uses of Common Alum.