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The span-roofed house we consider better adapted to the growth of Orchard fruit than the "lean-to" form, except where it is desired to force the fruit in advance of its season, in which case the lean-to possesses the advantages of better protection, and of being more easily heated from the smaller area of glass exposed to radiation.
For span-roofed Green-houses the rule is not so arbitrary, the glass not being lined with foliage, as in the case of graperies, the diffusion of light would not be materially obstructed. Under some circumstances, Green-houses may be placed east and west, as when a portion of the house is to be devoted to the purposes of propagation.
And now where were his ambitious castles; where was the successful inventor, the possessor of hundreds of thousands contemplating to build two span-roofed greenhouses in which he would have to work and perspire when the thermometer would often stand at from eighty to ninety degrees. However, he was full of hope, his ambition had received a severe blow, but it still clung to him.
We are now adopting for plant houses, low, narrow, span-roofed buildings, formed by 6 feet sashes, one on each side, the ends of the houses facing north and south. These we attach three together, on the "ridge and furrow" system, as shown in sketch.
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