I. ELECTRICITY AND MAGNETISM.--Improved Dynamo Machine.
Eight figures.
An Improved Manganese Battery.--By GEO. LEUCHS.
The Cause of Evident Magnetism in Iron, Steel, and other Magnetic
Metals.--By Prof. D. E. HUGHES. Neutrality.--Superposed
Magnetism.--Elastic Nature of the Ether Surrounding the Magnetic
Molecules. 3 figures.