SA Supplements

Boiler Plate Bending Rolls

The Quality of Steam

New Steam Line between New York and France

Improved Testing Machine

A Novelty in Railway Construction

Combined Road and Rail Truck Wheels

The Influence of Surface Condition on the Strength of Steel

New Gas Burner

Magnets

Steel and Hemp Hawsers

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

The Center of Population in 1880

Operations of the British Post Office

Public Instruction in the Province of Bologna

The Grave of William Penn

Important Archæological Discoveries in Assyria

Double Refraction

The Condenser Superseded

On Spectroscopy

Physics without Apparatus

Microscopy

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

New Flexible Stethoscope

Relation of Brain Power to the Weight of the Brain

The Treatment of Tetanus

Note on the Isolation of Strychnine

Physiology of Visual Purple

Bottcher's Gas Motors

Sodium.—Symbol Na.—Combining Weight 23

Ammonium.—Symbol Nh4.—Combining Weight 18

Adulteration of Foods in France

Flesh and Fat Producers

Butter-Making

Sweeny

Natural and Industrial History of the White Pine in Michigan

A Life-Time with Roses

A Remarkable Hailstorm in France

The Red Spot in Jupiter

The Tidal Evolution of the Moon

Black by Day and White at Night

The Battle of the Traps

Patents