Archive image from page 109 of Cyclopedia of American horticulture . Cyclopedia of American horticulture : comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches cyclopediaofame02bail Year: 1906 tion. The plan should secure the greatest amount of light, economy of space and of heating, and directness and simplicity in every operation. The simple sash-bar frame, without rafters (Fig. S'iS) is the most satisfac-


Archive image from page 109 of Cyclopedia of American horticulture . Cyclopedia of American horticulture : comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches cyclopediaofame02bail Year: 1906 tion. The plan should secure the greatest amount of light, economy of space and of heating, and directness and simplicity in every operation. The simple sash-bar frame, without rafters (Fig. S'iS) is the most satisfac- hill. Heated by steam. tory when properly constructed. The side walls should be low and the roof comparatively flat. Usually there is no glass on the side walls. Under most conditions. the house should run north and south, particularly if even in span (Fig. 839), but the lay of the land and the location of existing features usually determine the direc- tion. If the house runs east and west, or if it stands on sloping land (Fig. 840), an uneven or broken span is usually advisable. The widely different opinions re- specting the merits and demerits of the different spans are proof that each is good under certain circumstances. It is the prevail ing opinion that, in broken spans, the long roof should be to the south ; yet some of the best newer houses have the short span — which is then very -1 steep—facing the south (Fig. 843). In America, all Forcing-h o u s e s are heated by means of small wrought-iron pipes, which fit t o g et h e r with threads. The old-timo cast-iron flues may be employed for conservatories, Imt tin y :ire too bungling for Forc- ing-houses. Theyi|i> ni>t :nliini of suf&cient modification in lay-out to adapt thnii t' tin often croaked runsofPorcing-hou-iutublishnii'iits. Thewrought-iron pipes are heated either by steam or water. Each system has its advocates, which means that each has its merits. Steam is less costly to install, since less


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