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1. 

   Tides Yield Continuous Power in English Experimental Plant

   By Science NewsJuly 18, 1931

2. 

   Killing Kinsmen Possibly Practised in Mid-Europe

   By Science NewsJuly 18, 1931

3. 

   Scientist Studies Abandoned Mexican Cities on Cliff

   By Science NewsJuly 18, 1931

4. 

   Ordinary Decay of Teeth Is Controlled by Proper Diet

   By Science NewsJuly 18, 1931

5. 

   New Woods Sought for Lead-Pencils

   By Science NewsJuly 18, 1931

6. 

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

   By Science NewsJuly 18, 1931

7. 

   Novel Centrifuge Whirls with Speed Triple That of Bullet

   By Science NewsJuly 18, 1931

8. 

   Italy’s First Bird Station Established by Prince

   By Science NewsJuly 18, 1931

9. 

   Exploring the Extremes of Temperatures

   By Science NewsJuly 18, 1931

10. 

    In Science Fields

    By Science NewsJuly 18, 1931

11. 

    Surveying Yosemite Valley: “A Classic of Science”

    By Science NewsJuly 18, 1931

12. 

    Ferment in Digestive Fluid Purified for First Time

    By Science NewsJuly 18, 1931