Sugar Nitro-glycerine.

On Remelting of Cast Iron.

The Hardness of Metals.


II. ENGINEERING, ETC.--The Jet Ventilator. 4 figures.
Feeding Boilers at the Bottom. 2 figures.

The Honigmann Fireless Engine.--The fireless working of steam
engines by means of a solution of hydrate of soda.--With
several figures and diagrams.

Simple Methods of Calculating Stress in Girders.--By CH. LEAN.--With
full page of illustrations.

A Spring Motor.

Steam Yachts.


III. TECHNOLOGY.--Foucault's Apparatus for Manufacturing
Illuminating Gas and Hydrogen. 2 figures.

The Circle Divider.

Soluble Glass.--Process of manufacture.--Use.

Iron Printing and Microscopic Photography.--Formulas for