I have often had occasion to observe, that during the process of smoking glass-houses, for the purpose of killing green fly, the men who perform this duty remain in the house to keep, as they say, the coals glowing; and there they blow away with bellows, or what is more inconvenient, with their own wind-pipes. Having filled the house with smoke, they retire half suffocated. I tried it once after this fashion, but soon had recourse to a simple and more agreeable method, by which I was at once exempt from remaining all the time in the house. A glance at the engraving will best explain the process I adopted. Place four thumb-pots at equal distances in the path of the house; place on these a twelve-inch pot inverted, so that the rim of it rests upon each of them; then on the top of this place a six-inch pot, with glowing charcoal and tobacco paper, in such a position that the holes may form a communication. As soon as these pots are placed the workman leaves the house, and the draught through the inverted pot is so strong that if the greenhouse door is left open only for a few moments, the tobacco would be consumed; but when it is shut, as it ought to be, the coals remain in a golwing state, and fill the house in a very short time with smoke.

According to the size of the house, pots will be requisite at two or more places. Brown's patent fumigator is a very useful contrivance, particularly for pits; but its being so soon out of order induces me to consider the above method, for nurserymen at least, far superior. - Ben. - [This is a very good plan. - Ed.] - London Gardeners' Chronicle.