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Steam-Electric Marine Propulsion

The Efficiency of a Possible System of the Future

A New Method in Wet Excavation

Draining Instead of Emptying an Excavation

By C. M. Ripley

New Forms of Steel for New Uses

Structural Shapes Rendered Necessary by the Steel Building

By R. B. Woodworth

The Audiffren Refrigerating Machine

The Libyan Desert Railroad

Its Far-Reaching Influence in Egypt

Darwin and after Darwin

The New Biology Outlined

By Henry Edward Crampton

The Law of the Conservation of Energy

How Mayer Discovered It

By Florian Cajori

Elements of Electrical Engineering.—XXIV


By A. E. Watson

The Respiration of an Inland Lake

What Oxygen Means to Inland Waters

By E. A. Birge

Intensive Agriculture in Denmark

Electrical Notes

Engineering Notes

Trade Notes and Formulæ


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