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Features

Australian Oysters

The Arrow Point Spearheads and Knives of Prehistoric Times

Cruise of the “Albatross.”—III

The Increasing Productiveness of Labor, A Result of Invention

By Francis H. Richards

The Problem of Honeycomb

Santa Ana Canal

By J. B. Lippincott

Are Further Experiments needed for Determining the Atomic Weight of Oxygen

By Edward W. Morley

Materia Medica; Ancient and Modern

By E. S. Everett, Portlang, Maine

Pearl Fisheries of the Dutch East Indies

War Automobiles

Gun-Drill on a German Training-Ship

Origination of Printing Types by Photographic Methods

By Thomas Bolas

Trade Notes and Receipts

Selected Formulae

Trade Suggestions from United States Consuls

Working Drawings of an Electric Cab

Pictures Produced on Photographic Plates in the Dark

By William James Russell

The Industrial Production of Ozone

Report of the Commissioner of Patents to Congress for the Year Ending December 31, 1899

Department of the Interior, United States Patent Office

Search for Mercury in the Products of Vines Treated with Mercurial Mixtures

Patents!

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