IV. ELECTRICITY, ETC.--Gustavo Trouve and his Electrical Inventions.
--Portrait of Gustave Trouve.--Trouve's electric boat competing
in the regatta at Troyes.

Domestic Electricity.--Loiseau's electric naphtha and gas
lighters.--Ranque's new form of lighter with extinguisher.

Theiler's Telephone Receiver. 2 figures.

An Electric Power Hammer. By MARCEL DEPRETZ. 1 figure.

Solignac's New Electric Lamp. 3 figures.

Mondos's Electric Lamp. 2 figures.

V. METALLURGY AND MINERALOGY.--Aluminum.--Its properties,
cost, and uses.

The Origin and Relations of the Carbon Minerals.
By J.S. NEWBERRY.--An elaborate and extremely valuable review
of the genesis of carbon minerals, and the modes and conditions
of their occurrence.

Estimation of Sulphur in Iron and Steel. By GEORGE CRAIG.
1 figure.

VI. ARCHITECTURE, ETC.--The Armitage House.

Suggestions in Architecture.--An English country residence.