Vol. 20 No. #536
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More Stories from the July 18, 1931 issue

  1. Scientist Studies Abandoned Mexican Cities on Cliff

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  2. Ordinary Decay of Teeth Is Controlled by Proper Diet

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  3. New Woods Sought for Lead-Pencils

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  4. [Photograph]: In Their World There Is No Upside Down

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  5. Novel Centrifuge Whirls with Speed Triple That of Bullet

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  6. Italy’s First Bird Station Established by Prince

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  7. Exploring the Extremes of Temperatures

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  8. In Science Fields

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  9. Surveying Yosemite Valley: “A Classic of Science”

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  10. Ferment in Digestive Fluid Purified for First Time

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  11. Common Chemical Bath Ends Ringworm Epidemic

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  12. Air Vibrations in Organ Pipes Revealed by Pattern in Smoke

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  13. Ostrich Running 70 Miles an Hour Bulldogged from Auto

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  14. [Photograph]: Old Saber-Tooth Takes First Rights to the Kill

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  15. Graves of Huns Are Found in Mongolia

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  16. Dice Rolled in Near East More than 4500 Years Ago

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  17. Invisible Alpha Particle Path Bent by Great Magnet

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  18. Nature Ramblings: Weasel

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  19. Nervousness Major Cause in Automobile Accidents

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  20. Food Is Main Problem of Bacteria at Sea

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  21. First Glances at New Books

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  22. Front Matter

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  23. Tides Yield Continuous Power in English Experimental Plant

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  24. Killing Kinsmen Possibly Practised in Mid-Europe

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