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acid alcohol animals antitoxin bacilli bacteria bath become blood vessels body bones brain breathing calcium calories carbohydrates carbon dioxide cause cells cent child clothing cold communicable diseases condition constipation contains cure decrease develop Diagram diet digestion diphtheria early eating eggs eliminated especially Eustachian tube exercise eyes fatigue feet Gonorrhea growth hair heart heat Imhoff tank immunity increase incubation period individual infection iodine irritation known light liver lungs meat menstruation mental metabolism milk minerals mucous membrane muscles necessary nerve nervous system normal nose and throat occur organs ovum oxygen pain patient person physical physician posture prevent produce proteins removed result scarlet fever Schick test secretion sewage skin sleep spinal substances sufficient amount sugar supply susceptible symptoms syphilis teeth temperature tion tissues tonsils treatment tuberculosis tubes typhoid fever usually uterus vaccination vegetables Vitamin waste products weight