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Explosion of Two Steam-Boilers at Jewell's Mill, Brooklyn, N. Y

“Equidistant Gear Cutters”

By C. W. MacCord

Centrifugal Ship's Pump

Launch of the Colossus

Large Plate-Shears

The Pennsylvania Steel Company

The Progress of the Metallurgy of Gold and Silver in the United States

By T. Egleston

Gold and Its Manufactures

Watch Cases, Their Uses, Materials, and Qualities

The Manufacture of Cloisonne at Peking

English Universities

The Manufacture of Powder

The Influence of Mathematics on the Progress of Physics

By Arthur Schuster

Photographic Notes

The Action of Quinine and Salicylic Acid on the Ear

The Action of Quinine and Salicylic Acid on the Human Ear

Discharge of Electricity by Heat

Why We Cough and How We Cough

Adulteration of Drugs in England

Storage of Electricity

Ear Disease

Simple Directions for Collecting, Preserving, and Packing Insects

By Frederick Leroy Sargent

Possible Food Plants for the Cotton-Worm

Experiments with Caged Pythons

Mexican Caves With Human Remains

By Edward Palmer

A New Gentian

Malaga Raisins

On the Conservation of Solar Energy

By W. B. Carpenter

Constituency of Wood

The Timber Line

By Henry Gannett

Ironwood Tree

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