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Attempts to Explain Gravitation

Theories To Account for a Fundamental Property of Matter

Lonǵ Steel Shavinǵ

Modern Conceptions of Electricity

The Views of Physicists To-day

Photoǵraphy in Detective Service

Aeroplane Service in the Recent French Maneuvers

The Aviator as a Scout

Mutations amonǵ Shrimps

The Great Star Map.—VII

Some Incidents of the Work—Continued

By H. H. Turner

The Distortinǵ Mirror in Art

Vagaries of Great Painters

By P. G. Konody

A Roman Boat Unearthed in Enǵland

A Relic of the Past

The Supply of Iron

By James F. Kemp

Use for Mica

“Historiometry” as an Exact Science

Quantitative Methods in the Study of History

A BlacK Day in Aviation

Four Aviators Killed in France and America

By John Jay Ide

Electrolytic Copper Free from Arsenic

The Laboratory and Commercial Production of Oxyǵen

A Review of the Principal Methods Proposed

By A. S. Neumark

Enǵineerinǵ Notes

Trade Notes and Formulæ

Rules Governing the Competition for the $15,000 Flying Machine Prize Offered

By Edwin Gould


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