PRESENT STATUS OF THE PASTEURIZATION OF MILK 
Table 2. — Comparison of extent of pasteurization of milk in cities in the United 
States in 1915, 1924, and 1930 
Population of cities 
Cities reporting 
Cities with no 
pasteurized 
milk 
Cities 
having 
some 
raw 
milk 
Milk pasteur- 
ized 
1915 
1924 
1930 
1924 
1930 
1930 
1924 
1930 
500,000 and over ... ...... 
Number 
9 
40 
19 
30 
78 
168 
Number 
9 
37 
19 
25 
60 
105 
73 
Number 
11 
56 
13 
37 
56 
92 
79 
Number 




2 
21 
20 
Number 





6 
144 
Number 
11 
55 
13 
37 
53 
90 
73 
Per cent 
98.1 
81.7 
66.6 
66.6 
67.0 
42.5 
33.6 
Per cent 
97 1 
100,000 to 500,000 - 
84 9 
75,000 to 100,000 
81.5 
50,000 to 75,000 
72.2 
25,000 to 50,000 
73.1 
10,000 to 25,000 
52.1 
Under 10,000 ..... 
27.1 
Percentage of cities in which the percentage of pasteurized milk was — 
Population of cities 
90 to 100 
per cent 
50 to 100 per cent 
10 to 50 per cent 
to 10 per cent 
1924 
1930 
1915 
1924 
1930 
1915 
1924 
1930 
1915 
1924 
1930 
500,000 and over 
100,000 to 500,000 
75,000 to 100,000 
50,000 to 75,000 
25,000 to 50,000 
10,000 to 25,000 
Per 
cent 
100.0 
56.8 
26.3 
20.0 
20.0 
12.4 
5.5 
Per 
cent 
90.9 
53.6 
50.0 
40.5 
30.4 
17.4 
11.4 
Per 
cent 
77.8 
30.0 
26.3 
12.3 
16.7 
6.0 
Per 
cent 
100.0 
91.9 
73.6 
80.0 
80.0 
45.7 
41.1 
Per 
cent 
100.0 
96.4 
84.6 
77.8 
80.4 
55.4 
25.0 
Per 
cent 
22.2 
50.0 
42.1 
50.0 
39.7 
23.8 
Per 
cent 
0.0 
8.1 
15.8 
12.0 
13.3 
31.4 
27.4 
Per 
cent 
0.0 
3.6 
15.4 
22.2 
17.8 
33.7 
12.0 
Per 
cent 
0.0 
15.0 
21.0 
20.0 
15.4 
10.7 
Per 
cent 
0.0 
0.0 
10.6 
8.0 
5.0 
2.9 
2.7 
Per- 
cent 
0.0 
0.0 
0.0 
0.0 
1.8 
10 9 
Under 10,000 „ ... . 
63 
1 38 of these towns and cities were reported by a State board of health. 
The tendency in this country is to pasteurize practically all milk 
sold for direct consumption. The 1930 survey shows that 14 cities 
and towns in eight States required pasteurization of all milk. In 16 
cities and towns, certified milk or milk of equal grade is the only raw 
milk allowed to be distributed. Since 1924 the percentage of cities 
having more than 50 per cent of their milk pasteurized has increased. 
The cities of 50,000 to 75,000 population having from 50 to 100 per 
cent of their milk pasteurized apparently have not increased, although 
Table 2 shows that more cities of this size are pasteurizing from 90 
to 100 per cent and from 10 to 50 per cent of their supply. 
The larger cities were the first to adopt pasteurization. However, 
a study of the figures show that the trend of the smaller cities is 
toward its adoption. In Table 2, by deducting the number of cities 
having some raw milk from the cities reporting, it is to be noted that 
11 of the 12 cities having no raw milk in 1930 are within the groups 
under 10,000, 10,000 to 25,000, and 25,000 to 50,000, and only two 
groups, the under 10,000 and 10,000 to 25,000, report cities with no 
pasteurized milk. In the 10,000 to 25,000 group there are only 30 per 
cent as many cities reporting no pasteurized milk in 1930 as in 1924. 
The facts presented in Table 2 are accentuated in Table 3. Re- 
ports from the same 125 cities of over 10,000 population were avail- 
able for both 1924 and 1930, and have been placed in Table 3 in the 
population groups as in Table 2 . Each group shows as many or more 
