2. There is no better method for preventing the spread of contagious diseases than perfect isolation of the infected, and thorough disinfection of all articles of clothing or bedding which have been in contact with the infected. Many persons erroneously believe that every child must necessarily have the measles, and other contagious diseases, and they, therefore, take no precautions against the exposure of their children. The liability to infection diminishes as age advances, and those individuals are, as a rule, the strongest and best developed who have never suffered from any of the contagious diseases. Although, vaccination is the great safeguard against-pox, yet it should never prevent the immediate isolation of those who are suffering from this disease. 3. To avoid the injurious effects of impure air, the following rules, should be carefully observed. The admission of air which contains anything that emits an unpleasant odor into closed rooms should be avoided. The temperature of every apartment should be kept as near 70° Fahr. as possible, and the air should not be overcharged with watery vapor. Provisions should be made for the free admission into and escape of air from the room at all times. When an apartment is not in use, it should be thoroughly ventilated by opening the windows. Those who are compelled to remain in an atmosphere tilled with dust, should wear a cotton-wool respirator. 4. To insure a healthy condition of the body, the diet of man ought to be varied, and all excesses should be avoided. The total amount of solid food taken in the twenty-four hours should not exceed two and a half pounds, and not more than one-third of this quantity should consist of animal food. Many persons do not require more than one pound and a half of mixed food. To avoid parasitic diseases, meat should not be eaten rare, especially pork. The amount of drink taken should not be more than three pints in twenty-four hours. The excessive use of tea and coffee should be avoided. Pickles, boiled cabbage, and other indigestible articles should never be eaten. 5. To avoid the evil effects of alcoholic liquors, perfect abstinence is the only safe course to pursue. Although one may use spirituous liquors in moderation for a long period of time and possibly remain healthy, yet such an indulgence is unnecessary and exceedingly dangerous. A person who abstains entirely from their use is safe from their pernicious influence; a person who indulges ever so moderately is in danger; a person who relies on such stimulants for support in the hour of need is lost.