We are all made to breathe the pure air of heaven, and therefore much illness is caused by being constantly in-doors. This is especially the case with mothers of families, young milliners, ironers, shoe-makers, tailors, &c. Let such persons make a point, whenever it is possible, of taking exercise in the _open air_ for at least an hour and a half, _daily_. Time would be saved in the long-run, by the increased energy and strength gained, and by the warding off of disease. Be sure to get your children vaccinated, between the third and sixth month after birth, before teething begins, and when they are in a good state of health for it. This would save a great many lives. On no account give your children laudanum, or any kind of sleeping medicine; numbers are killed by it. 336. _Directions in severe Sickness._--Whenever any one of your family is taken violently ill, send as soon as possible for the most skilful physician--and follow, carefully, his orders. But, many times, the mother is the best physician, and the only one needed for her children, if she has been trained to take proper care of her own health, as every woman should be. The following recipes and directions may be of great service to young mothers, and those who have not been accustomed to minister to the sick. 337. _To purify the Chambers of the Sick._--Close the windows and doors of the room to be purified, except one door; close also the chimney aperture, except two or three inches at the bottom, and remove all the iron and brass furniture; then put three table-spoonsful of common salt into a dish or pan, place it upon the floor of the apartment, and pour at once upon the salt a quarter of a pint of oil of vitriol; retire, and close the room for forty-eight hours, during which time vapor will continue to rise and diffuse itself completely through the room, so as to destroy the matter on which infection depends. The room may then be entered, the doors and windows thrown open, and a fire made in the grate, so that the apartment may be perfectly ventilated. 338. _To prevent Infection._--As a preservative, carry with you and smell occasionally, a handkerchief sprinkled with this mixture; half an ounce of spirits of camphor, half a pint of water, and five ounces of pyroligneous acid. Cascarilla bark is good to smoke, to prevent the effects of malaria, and in sick rooms to correct bad effluvia. It yields a fine aromatic odor, and is very wholesome for sedentary and studious people to smoke, if mixed with good tobacco. The proportions for either of these purposes are as follow: one pound of Turkey tobacco, four ounces of Dutch canister tobacco, and one ounce of Cascarilla bark, broken small; mix the above, and smoke a pipe of it every evening, when the house is shut up; it is also a good digester after meals.