19 
a somewhat higher morbidity rate among negroes than among 
wliites. In the corresponding period (May 1 to November 1) of 
1907 the conditions were reversed. The negroes then comprised 
29.18 per cent of the population and furnished only 26 per cent of 
the typhoid-fever cases. 
In the 1906 period (June 1 to November 1) negroes composed 
29.1 per cent of the population and furnished 32.1 per cent of the 
typhoid fever cases. 
For a full discussion of the racial distribution of cases for the 
calendar year, see page 26, under Prevalence.” 
NATIONALITY. 
The following table gives the nationality of the cases, along with 
the number of foreign-born, in the District of Columbia for 1900, 
accordmgio the United States census report. F or some of the nation- 
alities the population has no doubt changed considerably since 1900, 
so that the figures in the table are not strictU comparable: 
Nationality. 
Number 
1908. 
of cases. 
1907. 
1 Number of 
1 native and 
foreign-bom 
in District 
of Columbia, 
L^nited States 
Census, 1900. 
American 
522 
495 
258,599 
Austrian 
2 
0 
187 
Danish 
0 
1 
88 
English ' 
2 
3 
2,299 
French 
1 
0 
389 
German 
3 
5 
5,857 
Hungarian 
0 
1 
48 
Irish 
1 
5 
6,220 
Italian 
5 
11 
930 
Russian . 
3 
1 
807 
Scotch 
1 
0 
574 
Swedish 
2 
1 
234 
Total 
542 
523 
SEX. 
Of the 542 cases, 314 occurred in males and 228 in females. Males 
compose about 48 per cent and females about 52 per cent of the 
population of the District of Columbia; 59.77 per cent of the cases 
were among males, showing, as was the case in the groups studied 
by us in 1906 and 1907, a somewhat higher typhoid-fever morbidity 
rate among the males. 
The higher rate among males is probably due largely to men being 
more exposed to infection by occupation habits and the more frequent 
practice of taking meals at lunch counters, eating houses, restaurants, 
etc., away from the place of residence. This view is supported by the 
fact, as shown in the table of ages of the cases given below, that the 
