A correspondent from Dundas, Ontario, writes: "I had a small conservatory built last summer, 16x20, and heated by a Hitchings boiler through coils of four-inch cast pipes. I had a lot of fine monthly roses heated through the summer for winter blooming, and which was put in the conservatory early in the fall along with an assortment of other flowers. They all grew nicely until the heating with the boiler was started, then every thing went back; the leaves withered on the roses, the buds on the other flowers dropped off, and I got quite discouraged until I read your article in the January number of the Gardeners' Monthly and Horticulturist. I had coated the heating pipes with gas tar. I am now in a quandary whether to let the flowers freeze or creosote them, (which you say is the only alternative,) until I can burn the tar off the pipes in the summer. I have only taken your magazine the past year; had I taken it sooner I might have saved myself the disappointment and annoyance of trying to grow flowers in the poisonous atmosphere of gas tar.

[It will do good service if anything effective can be discovered which will destroy the creosote element, without taking down the pipes. If any one learn, we shall be glad to know. - Ed. G. M].