Volume 69, Issue 1780supp
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Features
Mendel and the Origin of Species
How the Body Protects Itself against Micro-Organisms
An Internal-Combustion Pump.—I
Applications Of A New Principle
Combustion and Explosion.—I
A Primer On Explosives For Coal Miners
A New Epoch in Natural Science
What is Science?
Notes on Halley's Comet
Interesting Facts About our Celestial Visitor
Counting our Population by Machine
A Card Catalogue Of The American People. By Census Director Durand
A Cent's Worth of Electricity
Aeroplane Accidents
Why They Occur