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The Nature of Viscosity, How ItHas Been Estimated and Measured, Its Value II Every-Day Life

By Nicolas Flamel

The Electric Furnace—I

A Survey of Its Development, Its Scope and Its Future

By F. Rowlinson

River Bends and Meanders

Mechanical Analysis of the Forces atWork Suggests That Meanders Result from “Buckling”

By Colonel Hoc

Recent Progress in Aerial Photography

Remarkable Improvements During War and Applications To Peace-Time Needs

By L.-P. Clerc

Yttrium Mixed Metal

A Preliminary Study in the Production and the Properties of the Rare Earth Mixed Metals

By J. F. G. Hicks

How Honeybees Produce Honeycomb—II

From Nectar the Bees Make Both Honey and Wax, from Wax They Build Cylinders to Hold the Honey

By Edward F. Bigelow

The Semi-Diesel Engine

The Structural and Operating C haracteristics of the Hot-Bulb Engine and Its Economic Position

By H. F. Shepherd


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