FLIES.
[To ion EDITOR Or 71U "BMTAT071.'7 Sra,—Your article upon flies (Spectator, April 18th) will without doubt excite a considerable amount of interest, which, far from being merely academic, will issue in many practical and useful suggestions. You yourself hint at the possibility of finding some chemical which could be sprayed on to a farm manure and, while not lessening its value as a fertilizer, would destroy the insect life in it. May I add another similar suggestion ? Is it not possible to introduce into the composi- tion of the " fast" distempers, now so much used, something which would have the effect of making walls finished there- with unattractive resting-places for these pests ? Further, in view of the fact that not more than ten per cent, of the ordinary farm manures are of any real value, would it not be possible for the public authorities to take some steps to diminish the right to accumulate large quantities of such, and to do all that is practicable to encourage the use of the patent manures which are of so much greater value ?—
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