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The sun flower as a type of flowering plants by Anne B. Jewett, 1890

The Sun Flower as a Type of Flowering Plants by Anne B. Jewett, 1890, Page 71

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68. cloudy days, whether it grows more in cool weather or when it is warm: These and similar questions arise which can only be solved by experiment. For the purpose of solving some of these questions in regard to the Sun-Flower, a simple auxanometer was arranged which consisted simply of two groved wheels over which a thread was passed which was attached by one end to the top of the stem
 
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