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Nocturnal Animals Subject of Study by Scientists

Venus, Queen of May Evening Skies

Steel-like Glass Permits Centrifuge Observations

German Scientist Confirms Existence of Neutrons

Lost in Space: Our Sun’s Twin

Booklists of the A. A. A. S.

[Photograph]: Saving Young Eyes

Men Attacked by New Brain Disease of Horses

Which Was the First Steamboat? “A Classic of Science”

Restriction Urged on Use of Poisonous Thallium

Nature Rambling: A Miner for Worms

Recent Volcanic Eruptions May Affect World Weather