. Principles of plant culture; an elementary treatise designed as a text-book for beginners in agriculture and horticulture. Horticulture; Botany. 118 Principles of Plant Culture. 187. Potato Foliage is often Injured by Sun Heat in sum- mer, as is shoTin by the browning of the leaves from the tip and edges toward the center, or on the border of holes made by insects. This affection, known as tip-burn, is due to the destruction of protoplasm in the cells and is often mistaken for the work of fungus. It is most serious in dry seasons. ISTo remedy for it is known, but it may be in part avoided by
. Principles of plant culture; an elementary treatise designed as a text-book for beginners in agriculture and horticulture. Horticulture; Botany. 118 Principles of Plant Culture. 187. Potato Foliage is often Injured by Sun Heat in sum- mer, as is shoTin by the browning of the leaves from the tip and edges toward the center, or on the border of holes made by insects. This affection, known as tip-burn, is due to the destruction of protoplasm in the cells and is often mistaken for the work of fungus. It is most serious in dry seasons. ISTo remedy for it is known, but it may be in part avoided by selecting varieties least subject to it. B â The Plant as Affected by Ex- CESSi\'E Cold 188. The Immediate Effect of Cooling the Plant is to check the activity of its vital processes. When a certain degree of cold is reached, the proto- plasm loses its power to imbibe water (63); hence the plant tissues become less turgid, and the foliage droops somewhat. "With a sufficient reduc- r f tion of temperature, ice crystals form ifj' within the tissues and the succulent parts of the plant assume a glassy Fig. 59. Trunk of ap- "^ rr^, j- i â j- pie tree inclosed in lath appearance. The foliage of many screen. plants, as Celery, parsnip etc., assumes an* abnormal position when frozen. 189. The More Water Plant Tissues Contain, the Sooner they Freeze. Since the water of plants is not pure, but is a solution of various substances, it does not freeze at the freezing point of pure water (32° F.), but at a lower. .Jl. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Goff, E. S. (Emmett Stull), 1852-1902. Madison, Wis. , The Author
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