718 
not upon the basis of the infantile population alone. To eliminate 
as nearly as possible error from these causes, no effort has been made 
to gauge the results of milk inspection by the general infantile mor- 
tality. but consideration has been limited to one single class of dis- 
eases. the intimate relation between which and the milk supply is al- 
most universally concede : that is. to diarrhea and enteritis occur- 
ring among children under 2 years of age. 
TThen a sudden drop in the death rate from any particular cause 
is practically coincident with the inauguration of measures intended 
to bring about that very result, when there is no other discoverable 
cause for such drop, and when the lower death rate persists with the 
continuance of such measures and continues to fall in proportion, 
more or less, to their efficiency, it is reasonable to suppose that the 
relation of cause and effect exists. And such are the circumstances 
with respect to the improvement in the milk supply of the District 
of Columbia and the diminution in the mortality from diarrheal 
diseases among persons less than 2 years old. The beginning of a 
persistent fall in the general death rate appears when we compare 
the figures for 1892 with those for 1893. A fall in the death rate 
of infants under 1 year of age appears at the same time. But no 
permanent lowering appears in the death rate from diarrhea and 
enteritis among children under 2 years of age until the second year 
after the enactment of the milk law. This law was enacted [March 2. 
1895. and a certain period elapsed before it could be put into effective 
operation. The death rate from diarrhea and enteritis among infants 
during the fiscal year following its enactment was 168 per 100,000. 
The next year it had fallen to 151, the third year to 136, and the 
fourth year to 110. There have, of course, been slight fluctuations. 
In the calendar year 1900 the death rate rose to 132 per 100.000, but 
the annual average for the five-year period, 1900-1901. was only 109, 
and during 1903 it fell to 91. In 1905 the rate was 101, and in 1906 
it was 97. The death rate from diarrhea and enteritis among chil- 
dren under 2 years old during the five-year period preceding the 
enactment of the milk law, in 1895, was 175 per 100.000. If the 
same rate had continued during the eleven years that elapsed after 
its enactment and prior to December 31, 1906, the number of deaths 
from these causes would have been approximately 5.777, or 1.872 
more than actually occurred. And if the number of fatal cases of 
diarrhea and enteritis, whether averted through the operation of 
the milk law or otherwise, was 1.872. how much more numerous niust 
have been the cases in which infants were spared attacks of a milder 
character ? 
Possibly some of the apparent saving of the lives of 177 infants 
yearly, and the apparent prevention of sickness, may have been due 
