All we have said hitherto applies to the summer weather, which is, alas for us! a very limited and uncertain quantity in our part of the world. The question of out-of-door exercise in winter and in wet weather is really more important; for who that could would not be abroad in the summer time? If the children are to have what is quite the best thing for them, they should be two or three hours every day in the open air all through the winter, say an hour and a half in the morning and as long in the afternoon.