Volume 31, Issue 808supp
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Features
Nomenclature or Vernacular in Brick Making
Floating Soaps
The Spirograph
An Inexpensive Mercurial Air Pump
Simple Method of Measuring Heights in Hasty Topographical Surveys
New Registering Barometer
The Statoscope
Atkinson's Cycle Gas Engine
Peary'S Greenland Trip
Swing Jib Countersink Drilling Machine
Animal Life on a Coral Reef
The Breeds of Dogs
Malarial Maladies and their Geographical Extension
To Those Who Neglect Shadows
An Examination in Pharmacy
A Simple and Rapid Method of Gravimetric Analysis
Useful Engineering Books
Kaolin Beds
Patents!
Building Plans and Specifications
Artificial Hornblende
The Scientific American Supplement. Index for Vol.31
January-June, 1891.