CHAPTER X 
WATER HYGIENE 
Tuat water has a close connection with the spread of disease needs 
no special emphasis. Johnson (1916) has given ample proof of this by 
collecting statistics from the large registration cities of the United 
States. (Fig. 59.) 
TYPHOID FEVER AT PITTSBURGH PA, 
on supplied 
rs installed 
. 07, Filte 
lati 
popu 
c 
of 
rd, 
Mech, ’09 
| zz 
ee 
re eee 
|_| jj jj fj {| ff 
1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 
Fie. 58.—Showing the Effect of a Pure Water Supply on the Death Rate from a 
Typhoid Fever in Pittsburg. (After McLaughlin, 1912.) 
The ‘ Mills-Reincke Phenomenon’ and the “ Hazen Theorem.” 
In 1893, soon after the establishment of the Lawrence, Mass., filtration 
plant, Mills, the city engineer, noticed a reduction in the general death 
rate along with a reduction in the typhoid fever death rate. This was 
also noticed for Hamburg, Germany, by Reincke. When Sedgwick and 
268 
