A subscriber, Philadelphia, says: "I have a space between two-houses where I am thinking about building a hot house; it faces south and stands back from the street. The sun strikes the west end about nine o'clock, A. M., and leaves the east end about two o'clock, P. M. The space is twelve by eighteen feet. Do you think it a good place? If so, can I grow a general collection of plants? Will it take more heat for a house twenty-four by eighteen feet, at 45° slant, than two houses twelve by eighteen feet, at 45° slant? Any suggestions will be thankfully received.

[The location is a very good one; it would be more economical to have but one house. - Ed. G. M].