For more than a year I have used kerosene to destroy mealy bug and scale louse, and have found it the most convenient and effectual remedy. 1 apply it to the backs of the insects witn a feather, and brush lightly around the axils of the leaves infested, and I cannot perceive any injurious effects of its use upon the most tender plants. Hot water cannot be used upon large specimen plants, besides, there are some succulent plants, like Mimulus, which will not endure 120° without injury. Of late years it seems utterly impossible to keep a conservatory or bay window free from these two pests, for the reason that every accession of new plants from the large greenhouses brings a new stock of bugs. For my own part I would rather pay double price for clean plants, than deal with a lousy florist.