A valued correspondent says: "I wrote you some year or so ago about large Norway Spruces, and even Scotch Firs being badly affected by the red and small white spider. I have now three trees nearly forty feet high, entirely dingy from these pests, which have likewise completely discolored many large pear-trees, and almost all my plums, axaleas, and Camellias. Mr. Charles Downing's pear-trees have also suffered very much from this enemy. Nothing but scrubbing the leaves seems to help the tree, and this on large pear-trees is bad enough, while on evergreens of large size, it is of course impossible. Syringing has no effect, since the evergreens suffer all through winter, and it would seem that neither cold, nor snow, nor rain, affects them. This is the third year in this neighborhood that we have been troubled. I should be glad to know if any of your correspondents are suffering in this way. The inner part of the Norway is so affected, and is so dingy and brown, as if covered by dust, as to make no growth, and presents a complete contrast in color to the terminal shoots, which are of the usual green".