This section is from "The Horticulturist, And Journal Of Rural Art And Rural Taste", by P. Barry, A. J. Downing, J. Jay Smith, Peter B. Mead, F. W. Woodward, Henry T. Williams. Also available from Amazon: Horticulturist and Journal of Rural Art and Rural Taste.
Observing a receipt for easy fumigation, I beg to hand you another, which I know from experience never fails, and is a still easier method; the plan was taught me by a foreman gardener, so I claim no originality of idea; but perhaps the hint may be as acceptable to amateurs as it was to me.
Get a wire riddle, or sieve, an article which ought to be in the possession of every one who pots flowers, and place it, bottom upwards, on three inverted flower pots, either on the floor, or lowest shelf of the greenhouse; then, on the riddle put a few red hot cinders, and on these some of the commonest rag tobacco. If economy is desired, mix double the quantity of damp moss with the tobacco, waive the riddle gently up and down to cause the draught to thoroughly ignite the moss, etc, replace it on the inverted pots, retire immediately, close doors and windows, and do not go in uutil the next morning, when the plants should be well syringed with rain water. I do this twice a year, and I keep my little greenhouse clear from blight, and all my plants clean and healthy. - B.
 
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