Greenhouse construction : a complete manual on the building, heating, ventilating and arrangement of greenhouses, and the construction of hotbeds, frames and plant pits . illbe quite satisfactory. Of course, any plants can begrown in them, but a wider house seems preferable forroses, carnations, lettuce, and for most forcing crops,particularly as the amount of air enclosed is greater inproportion to the amount of exposed glass surface, onwhich account the temperature can be easier regulated,and drafts of air prevented. THE LEAN-TO HOUSE. When it is desirable that the first cost shall be assmal
Greenhouse construction : a complete manual on the building, heating, ventilating and arrangement of greenhouses, and the construction of hotbeds, frames and plant pits . illbe quite satisfactory. Of course, any plants can begrown in them, but a wider house seems preferable forroses, carnations, lettuce, and for most forcing crops,particularly as the amount of air enclosed is greater inproportion to the amount of exposed glass surface, onwhich account the temperature can be easier regulated,and drafts of air prevented. THE LEAN-TO HOUSE. When it is desirable that the first cost shall be assmall as possible, and if the expense for fuel, ratlier thanthe crops grown in the house, is considered, the lean-to THE LEAN-TO HOUSE. 13 form, particularly if the structure is to be a small one,will be found of value. An idea of the shape of thehouse, and the reason for the name, can be obtainedfrom Fig. 7. If the house can be built against thesouth wall of a building, or against a steep sidehill,these will be additional reasons, as affecting the cost oferection and beating, for using this form of the other hand, this shape for a greenhouse has, per-. FiG. 7. LEAN-TO HOUSE {Oross Sectio7i). haps, more and greater objections than any other. Oneserious fault is that for three hours in the forenoon, andan equal period in the afternoon, the i)lants get little orno direct sunlight; another objection is that the lightthat they do get, coming all from the south side, is une-qually distributed upon the plants, and the leaves are allturned in that direction, thus giving the plants an unevenappearance. As grape or peach houses, the lean-to constructionanswers very well, and, where one has a wall that can be 14 GREENHOUSE CONSTRUCTION, utilized, the expense for building and heating will bevery small. A lean-to, with its roof sloi)ing to the north,answers very well as a propagating house. One of thesimplest ways of building one is to place it against thenorth wall of a three-
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