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Newspaper
Newberg Graphic
Location
Newberg, Oregon, United States of America
Date
Apr 22, 1920
Page
2
Oliver F. Kilham explains that chemical soil tests mainly aid investigations and are not reliable for choosing fertilizers. He describes plot tests, key plant nutrients nitrogen phosphorus and potash, their roles, and warns that results depend on field conditions and element availability.
English chemistry professor Sir James Dewar notes old soap bubbles show the molecule visible to the naked eye. He explains typical bubbles have about 100 molecular layers, while experiments produce single-layer black spots. He estimates a inch would require 1.33 million such bubbles stacked.
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