At a recent meeting of the Massachusetts Horticultural Society, Mr. J. W. Manning, after speaking of the universal prevalence of destructive insects, one following another through the season, said that the most effectual remedy for the canker worm is London purple or Paris green, the first being preferable. Being lighter it will remain suspended in the water better, and its color is such that it can be seen better. A slightly heaping teaspoonful to three gallons of water, or a pound to two hundred gallons, is about the right proportion; but the strength varies, and the exact quantity must be found by experiment. If too strong it will kill the leaves, and if not strong enough it will not kill the worms. It should be applied in a fine spray, either with a common garden syringe or by a portable pump with hose attachment. The latter may be placed in a wagon, with the poisoned water, for convenience in moving. All the foliage should be sprinkled. Sometimes it is necessary to make two applicauons, but frequently a single application will clear the trees for years.

In the grounds of Amos Hill of Belmont, where it was used in 1878, and those of the essayist, who in 1880 applied it to thousands of apple and elm trees in his nursery, few insects have been seen since, and a second application destroyed these. The best time is as soon as a perforation of the leaf can be seen, but it has proved effectual when the worms were nearly grown.