. The principles of agriculture, a text-book for schools and rural societies . Flg. 42. Opening ofa bua of pear. Fig. 43. The marking of tiie stem andthe spreading apart of the marks. ceptibly, indicating more oxygen than is contained in the this case the carbon dioxid used is in solution in the Elodea is common in still ponds. 201a. On the subject of temperature and plant life, compareBailey, The Survival of the Unlike, pp. 44-48, Chapters xix.; and Chapter xiii. of Gayes Great Worlds Farm. 202a. Compare Arthur and MacDougal, Living Plants andtheir Properties, pp. 85
. The principles of agriculture, a text-book for schools and rural societies . Flg. 42. Opening ofa bua of pear. Fig. 43. The marking of tiie stem andthe spreading apart of the marks. ceptibly, indicating more oxygen than is contained in the this case the carbon dioxid used is in solution in the Elodea is common in still ponds. 201a. On the subject of temperature and plant life, compareBailey, The Survival of the Unlike, pp. 44-48, Chapters xix.; and Chapter xiii. of Gayes Great Worlds Farm. 202a. Compare Arthur and MacDougal, Living Plants andtheir Properties, pp. 85-98, for a discussion of the influence ofcold in injuring plants. 203a. To test for starch in a potato tuber or other storage 130 JHK OK A(iia(ri>JlKE Fig. 44. Marking the root. organ, spread a drop of tincture of iodine on the cut the blue or violet color indicates the presence of the laundry starch. 203&. To determine that starch is formedonly in the green parts of leaves, secure aleaf variegated with white, like a eoleus or gera
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