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Boiler Plate Bending Rolls

The Quality of Steam

By John W. Hill

A Novelty in Railway Construction

New Steam Line between New York and France

Improved Testing Machine

Combined Road and Rail Truck Wheels

The Influence of Surface Condition on the Strength of Steel

Steel and Hemp Hawsers

New Gas Burner


Goodyear & McKay Sole Sewing Machines Boot and Shoe Sewing Machines

Method of Determining the Relations of the Actinism of Different Lights to the same Illuminating Power

Public Instruction in the Province of Bologna

Operations of the British Post Office

The Center of Population in 1880

The Grave of William Penn

Important Archæological Discoveries in Assyria

The Condenser Superseded

Physics without Apparatus

On Spectroscopy

By L. Ciamician


Double Refraction

By A. Cornu

The Treatment of Tetanus

New Flexible Stethoscope

A New Current of Induction Electricity; or, a New Method of Producing Electrical Nerve and Muscle Reactions

By William J. Morton

Relation of Brain Power to the Weight of the Brain

Sodium.—Symbol Na.—Combining Weight 23

Physiology of Visual Purple

Note on the Isolation of Strychnine

By Alfred H. Allen

Bottcher's Gas Motors


Flesh and Fat Producers


Ammonium.—Symbol Nh4.—Combining Weight 18

Adulteration of Foods in France

A Life-Time with Roses

Natural and Industrial History of the White Pine in Michigan

The Red Spot in Jupiter

A Remarkable Hailstorm in France

The Battle of the Traps

The Tidal Evolution of the Moon

Black by Day and White at Night


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October 15, 1881