The Liquefaction of the Elementary Gases.--By JULES JAMIN.

Examination of Fats.

Notes on Nitrification.--By R. WARINGTON.--Paper read before
the British Association at Montreal.

II. ENGINEERING AND MECHANICS.--Flow of Water through
Hose Pipes.

Iron Pile Planks in the Construction of Foundations under
Water.--3 engravings.

Sound Signals.--Extracts from a paper by A.B. JOHNSON.--Treating
of gongs, guns, rockets, bells, whistling buoys, bell
buoys, locomotive whistles, trumpets, the siren, and the use of
natural orifices.--2 engravings.

Trevithick's High Pressure Engine at Crewe.--2 engravings.

Planetary Wheel Trains.--By Prof. C.W. MACCORD.--With a
page and a half of illustrations.

Bridge over the River Indus, at Attock. Punjaub, Northern State
Railway, India.--Full page illustrations.

The Harrington Rotary Engine.--3 figures.

III. TECHNOLOGY.--Testing Car Varnishes.--By D.D. ROBERTSON.