The Red Spider is one of the most insidious enemies of plants, both when under glass and in the open air in summer. It luxuriates in a hot and dry atmosphere, and the only remedy that I can safely recommend to amateurs, is copious syringings with water, if in the greenhouse, so that a moist atmosphere can be obtained. This, of course, is not practicable when plants are grown in rooms, and the only thing that can then be done is to sponge off the leaves. It is this insect, more than any thing else, that makes it so difficult to grow plants in the dry air of the sitting-room, as it may be sapping the life blood from a plant, and its owner never discover the cause of his trouble. It is so minute as hardly to be seen by the naked eye, but its ravages soon show, and if the leaves of your plants begin to get brown, an examination of the under-surface of the leaf will usually reveal the little pests in great numbers. When they get thus established there is no remedy but to sponge the leaves thoroughly with water, or weak soapsuds.