The Yield of Flour Per Horse-Power

Carriage Bridge over the Pennsylvania Railroad

Electrical Car Signal

Microscopic Insects in the Skin

On the Eyes of Worms

Spider Lines

Paris Universal Exhibition of 1878

REGULATIONS FOB EXHIBITORS

The Paris Exhibition of 1878

The Portuguese Man-of-War

Appearance of Snow Fleas

Large versus small Car Wheels

Pneumatic Ore Stamps

High Pressure Engines

Detroit Water Works

Physical Society, London

Mill for Softening Middlings

The Age of the Rocky Mountains in Colorado

New Pumping Engine

Pinfold's Brickmaking Machinery

Pipes for Gas and other Purposes

[Journal Of Gas Lighting.]

Theory of the Bunsen Lamp

New Rotary Filter

On the Transport of Solid and Liquid Par Ticles in Sewer Gases

Oxidizing Action of Animal Charcoal

Singing Flame

Cleaning Diatoms with Glycerin

A Remarkable Example of Goldsmiths' Work

Enamelling Photographic Prints

Violet Light for Studios

Curious Explosion

Microscopic Examination of Hospital Walls

New Staining Fluid

Composition of Petroleum, and the Proper Standard of Safety

Steel Making by a New Process

New Mexico's Vast Coal Fields

Croton Chloral in Whooping Cough

Examination of Volcanic Dust

School Life and its Influence on Sight

The Safe Administration of Chloroform

Electrical Phenomenon at Sea

An Electrical Clock Setter

Royal Astronomical Society

Production of Rain by Human Agency

An observatory on Etna