C. H. S., Newmarket, Ontario, Canada, says: - "Being compelled by the narrowness of my lot, which runs east and west, to build my greenhouse ending the same way, I would be thankful to you for information as to whether there would be any advantage in building a span-roofed house over a lean-to ?"

[So much depends on what one wants to grow, and the circumstances attending management, that it is difficult to say, independently of these considerations, whether one should have a span-roofed house, or one on the lean-to principle. So far as we can understand our correspondent's wants, there seems to be no objection whatever to a lean-to house under his circumstances. - Ed. G. M].