Treatment of Ores by Electrolysis.--By M. KILIANI.

II. ENGINEERING, AND MECHANICS.--Electric Railway at Vienna.--With
engraving.

Instruction in Mechanical Engineering.--Technical and trade
education.--A course of study sketched out.--By Prof. R.H.
THURSTON.

Improved Double Boiler.--3 figures.

The Gardner Machine Gun.--With three engravings showing the
single barrel, two barrel, and five barrel guns.

Climbing Tricycles.

Submarine Explorations.--Voyage of the Talisman.--The Thibaudier
sounding apparatus.--With map, diagrams, and engravings.

Jamieson's Cable Grapnel.--With engraving.

A Threaded Set Collar.

III. TECHNOLOGY.--Wretched Boiler Making.

Pneumatic Malting.--With full description of the most improved
methods and apparatus.--Numerous figures.

Reducing and Enlarging Plaster Casts.