_Rats and Mice_.--A good cat is the best remedy for these annoyances. Equal quantities of hemlock (or _cicuta_) and old cheese will poison them; but this renders the house liable to the inconvenience of a bad smell. This evil, however, may be lessened, by placing a dish containing oil of vitriol poured on saltpetre where the smell is most annoying. Chloride of lime and water is also good. In using any of the above-mentioned poisons, great care should be taken to guard against their getting into any article of food or any utensil or vessel used for cooking or keeping food, or where children can get at them. XXXI. THE CARE OF YARDS AND GARDENS. First, let us say a few words on the _Preparation of Soil_. If the garden soil be clayey and adhesive, put on a covering of sand, three inches thick, and the same depth of well-rotted manure. Spade it in as deep as possible, and mix it well. If the soil be sandy and loose, spade in clay and ashes. Ashes are good for all kinds of soil, as they loosen those which are close, hold moisture in those which are sandy, and destroy insects. The best kind of soil is that which will hold water the longest without becoming hard when dry. _To prepare Soil for Pot-plants_, take one fourth part of common soil, one fourth part of well-decayed manure, and one half of vegetable mould, from the woods or from a chip-yard. Break up the manure fine, and sift it through a lime-screen, (or coarse wire sieve.) These materials must be thoroughly mixed. When the common soil which is used is adhesive, and indeed in most other cases, it is necessary to add sand, the proportion of which must depend on the nature of the soil.