A child ought never to be permitted to sit with his back to the fire; if he be allowed, it weakens the spine, and thus his whole frame; it causes a rash of blood to the head and face, and predisposes him to catch cold. Let a nurse make a point of opening the nursery window every time that she and her little charge leave the nursery, if her absence be only for half an hour. The mother herself ought to see that this advice is followed, pure air is so essential to the well-being of a child. Pure air and pure water, and let me add, pure milk, are for a child the grand and principal requirements of health. Look well to the DRAINAGE of your house and neighbourhood. A child is very susceptible to the influence of bad drainage. Bad drains are fruitful sources of scarlet fever, of diphtheria, of diarrhoea, &c. "It is sad to be reminded that, whatever evils threaten the health of population, whether from pollutions of water or of air,--whether from bad drainage or overcrowding, they fall heaviest upon the most innocent victims--upon children of tender years. Their delicate frames are infinitely more sensitive than the hardened constitutions of adults, and the breath of poison, or the chill of hardships, easily blights their tender life."--_The Times._ A nursery floor ought not to be _washed_ oftener than once a week; and then the child or children should, until it be dry, be sent into another room. During the drying of the floor, the windows must, of course, be thrown _wide_ open. The constant _wetting_ of a nursery is a frequent source of illness among children. The floor ought, of course, to be kept clean; but this may be done by the servant thoroughly sweeping the room out every morning before her little charge makes his appearance. Do not have your nursery wall covered with green paper-hangings. Green paper-hangings contain large quantities of arsenic--arsenite of copper (Scheele's green)--which, I need scarcely say, is a virulent poison, and which flies about the room in the form of powder. There is frequently enough poison on the walls of a room to destroy a whole neigbourhood. There is another great objection to having your nursery walls covered with _green_ paper-hangings; if any of the paper should become loose from the walls, a little child is very apt to play with it, and to put it, as he does every thing else, to his mouth. This is not an imaginary state of things, as four children in one family have just lost their lives from sucking green paper-hangings.