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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 70

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67. There are several questions which naturally arise concerning the growth and development of any plant and which can be solved only by experiment; questions concerning their growth at different times and under different circumstances; whether they grow more during the day time or at night when the chlorophyl-bearing bodies are not in a state of activity; whether it grows more on bright or on
 
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