A nursery is usually kept too hot; the temperature in the winter time ought _not to exceed_ 60 degrees Fahrenheit. A _good_ thermometer should be considered an indispensable requisite to a nursery. A child in a hot, close nursery is bathed in perspiration; if he leave the room to go to one of lower temperature, the pores of the skin are suddenly closed, and either a severe cold, or an inflammation of the lungs, or an attack of bronchitis, is likely to ensue. Moreover, the child is both weakened and enervated by the heat, and thus readily falls a prey to disease. A child ought never to be permitted to sit with his back to the fire; if he be allowed, it weakens his spine, and thus his whole frame; it causes a rush 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 their 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. “Pure air and water are practically the two great elements of health.”—_The Times._ Look well to the DRAINAGE of your house and neighborhood. A child is very susceptible to the influence of bad drainage. Bad drains are fruitful sources of scarlet fever, of diphtheria, of diarrhœa, etc. “It is sad to be reminded, that, whatever evils threaten the health of a population, whether from pollutions of water or of air,—whether from bad drainage or overcrowding, they fall heaviest on 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.” 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 walls 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 neighborhood.