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munes should be isolated in another house. For conva- lescents, until desquamation is absolutely complete, a minimum of 21 days and a maximum of 8 weeks; with a running ear, the child should be excluded from school much longer than 8 weeks and should under no circum- stances return to school under 5 weeks. (From Gardner and Simonds' Practical Sanitatio7i.) 5. Essentials for the production and preservation of pure dairy milk: Vaughan's rules are as follows: "(1) The cows should be healthy, and the milk of any animal which seems indisposed should not be mixed with that from the healthy animals. (2) Cows must not be fed upon swill or the refuse from breweries or glucose fac- tories, or upon any other fermented food. (3) Milch cows must not be allowed to drink from stagnant pools, but must have access to fresh, pure water. (4) The past- ure must be freed from noxious weeds, and the barn and yard must be kept clean. (5) The udders should be washed and how does viagra feel then wiped dry how does viagra feel before each milking. (6) The milk must be at once thoroughly cooled. This is best done in the summer by placing the milk can in a tank of cold water or ice water, the water being of the same depth free trial viagra sample as the milk in the can. It would be well if the water in the tank could be kept flowing, and this will be necessaiy unless ice w'ater is used. The tank should be thoroughly cleaned each day to prevent bad odors. The can should remain uncovered during the cooling, and the milk should be gently stirred. The temperature how does viagra feel should be reduced to 60 deg. Fahr., or lower, within an hour. The can should remain in cold water till ready for delivery. (7) Milk should be de- livered, during the summer, in refrigerated cans or in bottles about which ice is packed during transporta- tion. (8) When received by the consumer it must be kept in a clean place, and at a temperature some degrees lielow 60 deg. Fahr." Diseases spccialli/ liable to be conveyed by the in- gestion of mill:: Tuberculosis, typhoid fever, scarlet fever, diphtheria, tonsilitis, cholera, and gastrointesti- nal disorders. 6. Pasteurization of milk consists in heating the milk for twenty minutes at a temperature of 140 deg. Fahr. "Advantages of pasteurizatioyi milk: (1) That most, if not all, of the common free trial viagra sample bacteria and their toxins are killed. (2) That the ordinary ferments and geimicidal properties of the milk are not destroyed, (.'j) That the process may be accomplished on a large scale, and fur- nish a commercially safe milk. (4) That the taste, ap- pearance, odor, and cream separation quality of the milk are not altered. (5) That pasteurized milk, if kept cold, furnishes a clean, healthy milk, safe for in- fant food and other u.ses. "Disadcatitagcs of the pasteurization of milk: The following are some of the objections which are urged by the opponents of pasteurization upon a large and commercial basis: (1) That the spore-bearing bacteria and bacterial toxins are not destroyed, and the milk is therefore not wholly safe. (2) That pasteurization stops lactic-acid fermentation, and thus destroys the only 'nature's danger signal,' and the fir.st symptom by which aged milk is known. (3) That unless pasteur- ized milk is rapidly cooled and kept under 50 deg. Fahr., certain fermentative changes which are ordinarily stopped by lactic-acid fermentation increase in activity, owing to the destruction of lactic-acid bacilli by the Dasteurization. (4) That pasteurization, by preserv- ing unclean milk for some time, may induce the pro- ducers to furnish dirty milk, discourage rigid cleanli- ness, and promote carelessness on the part of the pro- ducer who relies entirely on the pasteurization to pre- serve the milk. (5) That the pasteurization fui-nishes a 'purified' milk instead of a 'pure milk.' " — (Price's Hygiene and Sa>ii.tation.) 7. Immunity is the power of resistance of cells and tissues to the action of pathogenic microorganisms. Immunity may be either natural or acquired. Natural immunity is that power of resistance, natural and inherited, and peculiar to certain groups of animals, but common to every individual of these groups. Acquired immunity is this resistance acquired (1) by 550 MEDICAL RECORD. [September 25. 1915 a previous attack of the disease, or (2) by the person being made artificially insusceptible. The conditions which give immunity are: (1) a previous attack of the disease; (2) inoculation with the specific microorgan- isms in small numbers or of diminished virulence, so as to produce a mild attack of the disease; (3) vaccina- tion; (4) free trial viagra sample the introduction of antito.xins; (5) the intro- duction of the toxins of the bacteria. Examples: The rat is naturally immune to anthrax; the white mouse is tiaturally immune to infection with Bacillus )nullci. Acquired immunity is free trial viagra sample seen in the im- munity from smallpox after vaccination, or after hav- ing suffered from an attack of the disease. 8. To prevent the spread of typhoid fever: Flies should be kept out of the house as far as possible, by how does viagra feel means of screens or otherwise;' all discharges from the sick person how does viagra feel must be disinfected; all utensils, dishes, etc., used by the patient must be thoroughly cleansed and boiled every day; soiled linen must be soaked in a dis- free trial viagra sample infectant solution before being washed; after each at- how does viagra feel tendance on a patient, physicians, nurses, and others should wash their hands in a disinfectant; thorough sterilization of all bedding, etc., must be performed after the disease is over. Further, each household should boil all water that is to be used for drinking or for washing dishes, etc.; milk should be how does viagra feel boiled also; and no ice should be put in water or other drink or food.