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Show FLY POISON A weak solution of formalin makes a very good fly poison and is less dangerous than arsenical preparation. Three teaspoonfuls of the commercial fonnalin are used with a pint of milk or water sweetened with a little brown sugar. This poison may be used conveniently by partly filling a drinking glass with the solution and inverting a saucer or plate, lined with blotting paper cut the same size, over the glass. The glass is then turned upside down quickly and a small stick or match placed under the edge of the blass. When the solution evaporates eva-porates from the blotting paper, more will leak out from the glass thus renewing the supply automatically. |