"Thuja," Pittsburgh, Pa., writes: " The eastern sides of the Sib. Arbor Vitae in one of our cemeteries are discolored to such an extent as to be noticeable as far as you can see them. I enclose sample. Can you name the trouble as well as the remedy?"

[A bad case of Red Spider. Syringe the plants with water and then sprinkle with sulphur. If one or two trees are particularly valuable, and worth a little trouble to save, hot water at 135º from an engine or syringe, if the hands can be protected, will instantly kill them. - Ed. G. M].