This troublesome pest in orchard houses, etc, is thus to be got rid of, according to a most experienced gardener: Sulphur on hot-water pipes, and also on walls outside exposed to the sun, are great helps for keeping red spider down, if associated with a moist atmosphere, or a free use of the syringe. From the hot-water pipe, and from the hot open wall exposed to the sun, the sulphuretted fumes given off are what the spider does not like, and these will flit, if not kill him, when he would walk among pieces and particles of the dry, cool sulphur as gay and as happy as a cricket. Dry heat is, of all circumstances, his delight; but an atmosphere saturated with moisture, and impregnated with sulphur fumes, is his detestation. A strong heat, if not attended with corresponding moisture, might not greatly hurt the spider, even though sulphur was used. Unless in very cold weather, indeed, we can hardly see how the pipes could be heated to near boiling point, and a close, moist atmosphere be contained in the house in July, or even part of June. There is no difficulty in keeping a peach house clear of spider, during the growing and swelling period, merely by keeping sulphur frequently on the pipes, with evaporating pans there also, and a moderate nse of the syringe.

Whenever the fruit is gathered, there is little difficulty in effecting a clearance. The house is kept rather close, and the trees are syringed several times a day with sulphur and lime-water, made by boiling a pound of quick-limc and a pound of sulphur in a gallon of water for a quarter of an hour, allowing it to settle, and pouring off the clear into a bottle, and then putting about a quartern, er a little more, but not more than half a pint, into a common-sited watering-pot fall of water, and syringing the trees well over, above, and under the leaves. The mixture will be more effectual, but not so cleanly, if a little size and soft soap are added. The above is One of the most economical ways of getting the properties of sulphur at once to bear upon the insects. In extreme cases, and where syringing could not well be done, a pair of nimble hands, with a small sponge, would soon wash every leaf on a tree, and remove every insect on it. Where cleanliness was an especial object, the sulphuretted lime-water should merely have the size in it. About a quarter of a pound dissolved in a garden pot holding about four gallons of water, will not be too much.

I have found it injurious to no plant to which I have applied it in such limited quantities; and when enough is in the water to make the stickiness just perceived, when a thumb and finger being wetted are placed together firmly, it will case up the vital powers of every little insect to which it is applied. Even when the glue or size was'used rather strong, the film formed on the leaf broke and fell off in pieces when dry.

Red Spider #1

The little insect known too well to gardeners under the name of red spider, has obtained its popular name from the delicate web which it spins on the leaves which it affects, either presenting mere scattered threads or a distinct sac, though it is in reality a mite, and not a spider. It is just visible to the naked eye, being distinguished by its reddish hue, which, however, varies with age and other circumstances, unless more than one species is included under the name, and its active habits. The leaves which it attacks have a peculiar mottled appearance, from the exhaustion of the chlorophyll*, which at once betrays its presence. It is not confined to stoves, but is often quite as prevalent upon walls, or even in the open ground, occasionally destroying1 whole branches of the trees which it affects. It is especially abundant in dry weather, and. in stoves in which the air does not contain a proper degree of moisture, and is far more easily prevented than cured. There are, indeed, remedies which are at once fatal, aa the fumes of burning snlphur; but these, unfortunately, if strong enough to destroy the insect, often destroy the plant at the same time; or even if the plant does not suffer, the eggs are not affected, and in a few days the plague is as bad as ever.

If the fumes of sulphur are used, it is quite astonishing to see the myriads which sometimes collect at the tips of decayed leafstalks, or on the leaves themselves, apparently not at all the worse for the discipline, if the fumes are not extremely strong. The proper course, however, is not to burn the sulphur, as is practised by many gardeners with certain destruction to their plants, but simply to volatilize it, and if this is done in a damp atmosphere, the red spider cannot stand against it. It is difficult, however, to regulate matters nicely; the best remedy, therefore, is prevention rather than cure. Unfortunately, however, melons (which are peculiarly liable to be affected), require, in certain stages of growth, a dry atmosphere, which favors the develop-ment of the red spider, while it prevents or checks canker and mould. Constant syringing appears to be the most effectual means to this end, but as in other cases of disease, the very first symptom should be carefully regarded, and the remedy at once employed. When the leaves have once become mottled, they are not in a fit condition to perform their especial functions properly, and even though the syringing should be effectual in preventing any further mischief, it cannot replace the unhealthy with healthy tissue.

Other remedies have been proposed, as strong tobacco smoke, turpentine, bruised laurel leaves, sublimed sulphur, a solution of soft soap; and favorable reports have from time to time been given of all; but, on the contrary, there have been as many records of failure, so that implicit confidence cannot be placed in any one of them.