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Features

The Manufacture of Liquid Carbonic Acid Gas

Nomenclature or Vernacular in Brick Making

By S. K. Fletcher

Floating Soaps

The Spirograph

An Inexpensive Mercurial Air Pump

By R. W. Wood

Simple Method of Measuring Heights in Hasty Topographical Surveys

The Statoscope

New Registering Barometer

Atkinson's Cycle Gas Engine

Peary'S Greenland Trip

By R. E. Peary

Swing Jib Countersink Drilling Machine

Animal Life on a Coral Reef

The Breeds of Dogs

Malarial Maladies and their Geographical Extension

By Angelo Celli

To Those Who Neglect Shadows

An Examination in Pharmacy

A Simple and Rapid Method of Gravimetric Analysis

By G. H. Bailey and J. C. Cain

Building Plans and Specifications

Patents!

Kaolin Beds

Artificial Hornblende

Useful Engineering Books

The Scientific American Supplement. Index for Vol.31

January-June, 1891.

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    Why Do Facts Fail?

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