The Garden Under Glass

HOUSING AND ARRANGING PLANTS 247 kill every thrip, mite or other insect likely to succumb to this treatment. Fumigating a Greenhouse The general method of fumigating a greenhouse is by means of some preparation in which nicotine enters largely. There are several such preparations on the market, and there is little to choose between them. An outfit consisting of a spirit-lamp, a conical-shaped tin perforated for the admission of air, and a saucer for containing the liquid, may be cheaply procured. The lamp is half filled with methylated spirits, the wick is allowed to stand clear a quarter of an inch at the top, and the lamp standing solidly on the floor is lighted. When fully aflame the tin frame is placedoverit, the sauceris put on, and the needful amount of liquid poured in. The ventilators must be tightly closed and all holes in the roof or sides of the house stopped up. The best time for fumigating is in the evening of a still night so that the lamp may be left in all night. Some few plants are disfigured by this vaporising, such as the young fronds of maidenhair ferns. But as these are not usually infested with pests which fumigation is intended to kill, they may for the time be placed in another house. The main item of caution is to see that the dose given is not overdone. The directions on the bottles show the amount per thousand cubic feet, so no mistake should occur. Measuring a House The means of ascertaining the cubical capacity of a house is to measure its length by its breadth, and the sum by the mean height. Thus, if a house be 15 feet long and 10 feet wide and 8 feet high at the apex and 5 feet high at the