. Principles of plant culture : an elementary treatise designed as a text-book for beginners in agriculture and horticulture. Horticulture; Botany. Plants as A fee ted by Cold. 113 187. Potato Foliage is often Injured by Sun Heat in summer, as is shown by the browning of the leaves from the tip and edges toward the center, or on J/the border of holes made b}' insects. This affection, known as " tip-burn," is due to the destruction of the protoplasm in the cells, and is often mistaken for ^ the work of a fungus. It is most serious in dry seasons. No remedy for it is known, but it may
. Principles of plant culture : an elementary treatise designed as a text-book for beginners in agriculture and horticulture. Horticulture; Botany. Plants as A fee ted by Cold. 113 187. Potato Foliage is often Injured by Sun Heat in summer, as is shown by the browning of the leaves from the tip and edges toward the center, or on J/the border of holes made b}' insects. This affection, known as " tip-burn," is due to the destruction of the protoplasm in the cells, and is often mistaken for ^ the work of a fungus. It is most serious in dry seasons. No remedy for it is known, but it may be in part avoided by selecting varieties least subject to it. - The Plant as Affected by Excessive Cold 188. The Immediate Effect of Cooling the Plant is to check the ac- tivity of its vital processes. When a certain degree of cold is reached, the protoplasm loses its power to imbibe water (63); hence the plant tissues be- come less turgid, and the foliage droops somewhat. With a sufficient reduction Ijwf of temperature, ice crystals form within lijjjjthe tissues and the succulent parts of Fig, 'r'eein- ^^^ "P^^^^ assume a glassy appearance, cased in lath screen. The foliage of man}' plants, as celery, parsnip etc., assumes an abnormal position when frozen. 189. The More Water Plant Tissue Contains, the Sooner it Freezes. 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. 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. : E. S. Goff
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