62 MICROBES, FERMENTS, AND MOULDS. 
of soda, which neutralizes the acidity of the saliva. 
It is, above all, essential that the feeding-bottle, all 
the utensils employed for the infant, and the infant 
itself, should be kept perfectly clean; and, unfortu- 
nately, this condition is too rarely fulfilled, especially 
ia inion ee Se ie Uh ale & te the. ne soe 
among the working classes in towns, and districts in 
which children are usually put out to nurse. The 
feeding-bottle in use in such cases generally smells 
so sour as to be offensive to every one who is not 
