Improved Dredger.--1 figure.--One ton bucket dredge.

History of the Fire Extinguisher.

How to Tow a Boat.--1 figure.

Railways of Europe and America.

Locomotive Painting. By JOHN S. ATWATER.

Crackle Glass.--New Process.

How Marbles are Made.

II. TECHNOLOGY AND CHEMISTRY.--Drawing Room Photography.

A New Method of Preparing Photographic Gelatine Emulsion by
Precipitation of the Bromide of Silver. By FRANZ STOLZE.

Taylor's Freezing Microtome.--1 figure.

Vincent's Chloride of Methyl Ice Machine. 10 figures.--
Longitudinal and transverse sections of freezer.--Half plan of
freezer.--Longitudinal and vertical sections and plan of pump.--
Details.--Vertical section of the liquefier.

Carbonic Acid in the Air. By M. DUMAS.

Influence of Aqueous Vapor on the Explosion of Carbonic Oxide