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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 72

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69. of the plant, and had a weight at the other end to keep it tense. The thread passed over the grooved wheels and down by a scale at the side and as the plant grew upward the weight went down the scale and in this way the difference in its growth at successive spaces of time could be measured. By means of this auxanometer I found, that the plants grew very slowly on a cool day,
 
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