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Theories of Ore-Genesis

Past and Current Views Considered

By F. H. Hatch

Pneumatic Grain Elevators

The Ideal Method of Handling Cargoes

By Jacques Boyer

Expenditures of One Hundred and Eighty-four American Cities, Giant Drilling Machine for Turbine Work

The Influence of Antivivisection on Character—I

Misrepresentations, Falsehood and Passion the Characteristics of Antivivisection Propaganda

By W. W. Keen

An Arithmetical Curiosity

Propelling Machinery for the Collier “Neptune”

The Reduction Gear and Dynamometer

The Use of the Pitot Tube

Filtration of Potable Waters

The Paterson Rapid System for Large Scale Operation

The Number and Light of the Stars

Is the Universe Finite ?

By S. Chapman

How Bodies Fall in Deep Vertical Shafts

By F. W. McNair



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