Automatic Fast Speed Telegraphy.--By THEO. F. TAYLOR.--Speed
determined by resistance and static capacity.--Experiments
Taylor's system.--With diagram.

Theory of the Action of the Carbon Microphone.--What is it?
--2 figures.

The Dembinski Telephone Transmitter.--3 figures.

New Gas Lighters.--Electric lighters.--3 engravings.

Distribution of Heat which is developed by Forging.

V. ARCHITECTURE, ART. ETC.--Villa at Dorking.--An engraving.

Arm Chair in the Louvre Collection.

VI. GEOLOGY.--The Deposition of Ores.--By J.S. NEWBERRY.--Mineral
Veins.--Bedded veins.--Theories of ore deposit.--Leaching
of igneous rocks.

VII. NATURAL HISTORY, ETC.--Habits of Burrowing Crayfishes
in the U.S.--Form and size of the burrows and mounds.--Obtaining
food.--Other species of crayfish.--3 figures.

Our Servants, the Microbes.--What is a microbe?--Multiplication.
--Formation of spores.--How they live.--Different groups
of bacteria.--Their services.