. Principles of plant culture : an elementary treatise designed as a text-book for beginners in agriculture and horticulture. Horticulture; Botany. 190 Principles of Plant Culture. same protections against excessive heat or cold are used as for the cold-frame; but the hotbed requires much the more care in ventilation, since the heating materia! generates vapor and carbonic acid, as well as heat, and these, when present in excess, are detrimental to plant growth. 366. The Greenhouse is an expansion of the hotbed, i. c., a structure sufflcientlj' large so that it may be entered, and with arrange
. Principles of plant culture : an elementary treatise designed as a text-book for beginners in agriculture and horticulture. Horticulture; Botany. 190 Principles of Plant Culture. same protections against excessive heat or cold are used as for the cold-frame; but the hotbed requires much the more care in ventilation, since the heating materia! generates vapor and carbonic acid, as well as heat, and these, when present in excess, are detrimental to plant growth. 366. The Greenhouse is an expansion of the hotbed, i. c., a structure sufflcientlj' large so that it may be entered, and with arrangements for heating b}- fire.* In temperate climates, greenhouses are usuallj' constructed 12 to 22 feet wide, with a gable or M roof, having a slope of 35° to 40°, covered with glass and with the ridge or ridges extending nortli and south (Fig. 94); but in very cold climates, a shed roof facing the south is preferable. Greenhouses are often built with one slope of the roof longer and less steep than the other, and with the ridge extending east and west. Such a roof is called a "two-thirds-" or "three-quarters span," according as the longer slope covers two-thirds or three-quarters of the width of the house. The long slope usually faces the south, but houses have recentlj' been built with the shorter and steeper slope facing the south, a plan thought to possess advantages for growing certain plants, as carnations. Provision is made for ventilation in glass houses by plac- ing a certain number of movable sash in the roof or else-. FlG. 94. Cross BtiCtioD of greenhouse. (After Grenier), Hotbeds are now being heated by fire to some 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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