Each year, as the temperature rises in June, all large cities are attacked by serious epidemics of diarrheal diseases in infants. These cases become more numerous as the summer advances—the mortality resulting usually being highest in August when infantile vitality has been reduced by the long continuance of heat. The cases always decline in number and severity as the days become cooler.
HEAT AS A CAUSATIVE FACTOR.
Judging from these facts it is certain that heat plays a very important part in causing these annual epidemics, and it is probable that it is a factor in several different ways.In the first place, a very large percentage of the children affected are artificially fed. Dr. Holt has reported that out of nearly 2000 cases he investigated, only three children were exclusively breast-fed. Heat favors the growth of germs either in cow's milk or the prepared food given the child.In