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Astronomical Telescopes at the Manchester Exhibition

The Age of the Stars

Geology Explained in the Simplest Form


Pot Vines

A Home-Made Incubator

By P. H. Jacobs

Observations on the Female Form of Phengodes Laticollis Horn

An Elephant Hunt in Ceylon

Experiments upon the Color Relation between Phytophagous Larvæ and their Surroundings

By E. B. Poulton

Curious Inventions

Optical Illusions

Oil Furnaces at the Forth Bridge Works

By E. W. Moir

To Prevent Rolling of Vessels

Street Railway Sleeping Car

The Development of the Mercurial Air Pump

By Silvanus P. Thompson

Magnetic Separator

Chemical and Allied Industries

Group VI.—Fine Chemicals, Alkaloids, Essences, and Extracts

By Watson Smith

A New Instrument for the Measurement of Radiation

By C. C. Hutchins

Isolation of Fluorine

A New Photometer for use in the Field

Building Plans and Specifications

Carbon Electrodes in the Decomposition of Acids

Corrosion of Lead Pipes


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January 28, 1888

Confronting Common Wisdom