Greenhouse construction : a complete manual on the building, heating, ventilating and arrangement of greenhouses, and the construction of hotbeds, frames and plant pits . a crop of this is the largest house of the kind, there aremany smaller ones constructed upon the same generallines, and they seem to be uniformly successful. LEAN-TO LETTUCE HOUSES. The lettuce is a plant that succeeds well in a lean-tolettuce house, such as is used by many of the lettuce LEAN-TO LETTUCE HOUSES. 155 growers in the vicinity of Boston, of which a cross sec-tion is shown in Fig. 83. Like all lean
Greenhouse construction : a complete manual on the building, heating, ventilating and arrangement of greenhouses, and the construction of hotbeds, frames and plant pits . a crop of this is the largest house of the kind, there aremany smaller ones constructed upon the same generallines, and they seem to be uniformly successful. LEAN-TO LETTUCE HOUSES. The lettuce is a plant that succeeds well in a lean-tolettuce house, such as is used by many of the lettuce LEAN-TO LETTUCE HOUSES. 155 growers in the vicinity of Boston, of which a cross sec-tion is shown in Fig. 83. Like all lean-to houses theseare easily warmed and are cheaply constructed, but theydo not have a sufficient pitch to the roof to secure themost benefit from the sun. They are commonly given apitch of about eighteen degrees, but even at this slope,a lean-to roof on a house thirty-three feet wide wouldrequire a north wall about fifteen feet high, while athree-quarter span liouse can have a i^itch of twenty-twodegrees, and the north wall need not be over ten ortwelve feet high. With houses up to a width of twenty-five feet, aproper slope can be secured without carrying the north. FIG. 83. LEAN-TO LETTUCE HOUSE {Section). wall to an undue height, or raising the glass too highabove the plants; unless upon a sidehill, this widthcannot be very much exceeded with this style of three-quarter span house can readily be made eightor ten feet wider than the lean-to, without carrying theroof to a greater height, while the north wall will beconsiderably lower than it would be in the lean-to. Hav-ing determined upon the width and style of roof for thehouse, the construction will be very simple, if the sug- 156 GREENHOUSE C0NSTRUCTI02T. • gcstions given in Chapters Y. and VI. as to the bestmethods of erecting the walls and roof arc followed. Lettuce houses should have from eighteen to thirtyinches of glass in the south wall, and, on many accounts,it is desirable that the alternate sash at least
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