If we build houses for the birds to nest in, provide feed for them and in other ways do what we can to attract them, they will soon learn that we are their friends. We must study their habits and always avoid frightening them. Next to a cat, the worst enemies of our song birds are the English sparrows. A sparrow is always fair game for the boy with a slingshot or rifle. In many places these sparrows have driven practically all the other birds out of the neighbourhood, have robbed their nests and in other ways have shown themselves to be a public nuisance. Until 1869 there were no sparrows in this country and now they are more numerous than any other variety of birds, and sooner or later, the Government will have to take steps to exterminate them or we shall have no song birds at all. The usual size of a bird house is six inches square and about eight inches high. It should always be made of old weather-beaten boards in order not to frighten away its prospective tenants by looking like a trap of some kind. The chances are that the sparrows will be the first birds to claim a house unless we keep a close watch and drive them away. One way to keep them out is to make the entrance doorway too small for them to enter. A hole an inch in diameter will admit a wren or chickadee and bar out a sparrow, but it will also keep out most of the other birds. The usual doorway should be two inches in diameter. It is surprising how soon after we build our bird house we find a tiny pair making their plans to occupy it and to take up housekeeping. Sometimes this will happen the same day the bird house is set up. Always provide some nesting material near at hand; linen or cotton thread, ravellings, tow, hair and excelsior are all good. Of course we must not attempt to build the nest. No one is skillful enough for that. Nearly all of our native birds are migratory, that is they go south for the winter. The date that we may look for them to return is almost the same year after year. Some few birds—bluebirds, robins, cedar birds and song sparrows will stay all winter if it is mild but as a rule we must not expect the arrival of the feathered songsters until March. The phoebe bird is about the first one we shall see. In April look for the brown thrasher, catbird, wren, barn, eave and tree swallows, martins, king birds and chipping sparrows. In May the principal birds of our neighbourhood will return—thrushes, vireos, tanagers, grosbeaks, bobolinks, orioles. The game birds—quail, partridge, meadowlarks and pheasants do not migrate as a rule. At least they do not disappear for a time and then return. When they leave a neighbourhood, they rarely come back to it. All the song birds begin nesting in May. Consequently we should have our bird houses “ready for occupancy” May 1st. It will take about twelve days for most birds to hatch their eggs. Some varieties will hatch three broods in a season, but two is the usual rule.