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Excavations in the Roman Forum

The Gold Mines of West Africa

By James Irvine

The Passy underground Railroad

Cast Iron

By R. Moldenke

Ships' Refrigerating Plants—Linde System

Trade Suggestions from United States Consuls

M. De Baye's Mission to the Caucasus

What the very Poor Eat—Dietaries of Slums in American Cities

Passiflora “Margaret Wilson.”

Miscellaneous Notes

Engineering Notes

Selected Formulæ

Approved Lightning Protection

A Short Treatise on the Historic and Modern Lightning Rod and its Daily Incorrect Application

By Nevil Monroe Hopkins

A New Device for Lighting Gas Burners

The Nature and History of Patent Rights

By E. L. Thurston


A Flashless and Soundless Gun


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