In the last number of the Horticulturist I noticed a cut showing a species of insect that infests the apple tree. Enclosed I send you another specimen of a "different breed." It is increasing on the trees in this section, and I have seen many trees so completely covered that it was impossible to see the bark on any part of it Examined with a microscope late in the spring, numerous insects can be discovered under each one of the scales. What becomes of them as they grow up, this deponent knows not - whether they are a creeping or flying animal - nor how they spread themselves. But I wish to inquire if you are troubled in like manner in New York, (I am inclined to think that those on my trees were imported from Buffalo, whence the trees came,) and if so, what remedy you use to extirpate the creatures. Last year I washed my trees with soap and water, and I thought it did them good, but this spring they are more plenty than ever. I think some of trying very strong lye on those most affected'and will try the experiment on one of them with strong tobacco water. If you can give us any useful information touching the premises, your subscribers in this vicinity will be very much obliged.

Josiah BOND. - Kenosha, Wis.

The insect referred to is the apple tree bark louse (coccus). You will find it described fully in Harris' Treatise, pages 221, 222, and 228, new edition. The following efficient remedy is given in that work: "A wash made of two parts of soft-soap and eight parts of water, with which is to be mixed lime enough to bring it to the consistence of thick whitewash." This to be applied with a brush, early in June, when the insects are young and tender. A wash made of two pounds of potash in seven quarts of water, and another, made of a quart of common salt in two gallons of water, are also recommended. The first we know to be effectual, when applied well at the proper time; the others, we have no doubt are equally so.

Will you oblige me with answers to the following queries in the next number of the Horticulturist!

Is there any species of Weeping Willow that is hardy enough to resist the cold of this latitude! I find that nearly half or more of the last year's growth upon one standing in my yard is dead. (1).

May a hedge formed of young hemlocks be cut and trimmed without damage, as one of buckthorn might be! (2).

Will you mention three or four hardy climbing plants, suitable to train up against the posts of a veranda, such as are of vigorous growth! (8).

If there is no willow that will be proof against the frost of this climate, will you please name a tree that may be an appropriate substitute for it that is hardy. A Subscribe. - Shrewsbury, Mass.

(1.) The new American Weeping Willow, from Europe, - a charming, hardy, weeping tree.

(2.) Nothing bean the shears better than the Hemlock.

(8.) The Chinese Wistaria; the Bignonia radicans, or trumpet flower; the Scarlet Monthly, or Coral Honeysuckle, or Monthly Fragrant Honeysuckle; the Aristolochia Sipho (Birthwort); the American Ivy (Ampelopsis); and the Periploca, or Virginia silk, are fine hardy climbers. To these we may add the Ayrshire and Prairie Roses.