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Colloidal Fuels

Coal Combined with Petroleum Fuel-Oils, with or without Coal Tars

Concrete as a Chemical Engineering Material

By Maximilian Toch

Acid-Resisting Iron

The History and Present Status of a British Contribution to Metallurgy

The Influence of Aviation upon Mathematical Physics

Artificial Gravel

The Sizes of Cells

The Influence of Astronomy on Human Thought

The Study of the Universe in Its Role as the Science of Infinite Space and Infinite Time

By Rev. Hector Macpherson

Some Native Industries of German Cameroon

The Character and Nature of the West Coast Bantu from the European Standpoint

Philosophy and Spiritualism

Physical Relativity

A Survey of Old and New Hypotheses in this Field

By G. W. De Tunzelman

Determination of the Compressibility of Solids at High Pressures

The Shell Builders—II

A Brief Introduction to the Study of Conchology

By R. W. Shufeldt

Cutting Lubricants

Considerations of Theory and Practice that Govern their use

Covering Power and Illuminating Power of Lenses: Tests and Performance

By C. Welborne Piper

The Position of the Illuminant in Enlarging and Projection


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