Volume 73, Issue 1889supp
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Features
The Purity of Natural Waters—III
The Influence of Aquatic Organisms, of Domestic Sewage and of Industrial Waste
Recent Proǵress in Spectroscopic Methods—II
Past Achievements and Future Prospects
A Proposed Expedition to Crocker Land
American Explorers to Investigate the North Polar Regions
Friction between Solids in Motion
An Instrument of Precision for Accurate Investigation
The Buildinǵ up of an Industrial Enterprise
The Prime Requisites: Brawn and Brain
The Conference of Washinǵton
Meeting of the International Union for the Protection of Industrial Property
The Deutsch Aero-Dynamic Institute, Paris
An Establishment for the Study of Problems Relating to Aviation
Mayers Paper on the Conservation of Enerǵy
Mechanical Water Softener
An Important Adjunct for Boiler Plants
Directed Radio-teleǵraphy without Vertical Antennæ
Horizontal Wires Are Found to be Fully Efficient
X-Ray and Ordinary Stereo-Photoǵraphy Combined
A Device by Which Internal Structures are Seen in their Actual Location
Natural Selection in Man
The Self-startinǵ Syphon
Its Principle and Construction
Auxiliary Player for Reed Instruments
“Artificial Wind” for Musicians
The Menz Wheel—An Automobile Wheel with a Removable Felly
Life without Oxyǵen—I
The Anaerobic Beginnings of Life