45 
The above indications of a greater frequency of intestinal worms 
among foreign than among native born patients were found, however, 
not to be equally present among all nationalities, and in the case of 
immigrants from one country the rate of total infection was some- 
what less than among persons of- native birth. The great majority of 
foreign-born patients were Irish, German, and English. Among the 
other nationalities represented — none, however, in sufficient numbers 
to be considered separately — Canadians, Swedes, Swiss, Austrians, 
Poles, and Italians largely predominated. 
The rates of total infection among the patients of German, of 
English, of Irish, and of other foreign birth were as follows : 
Examined. 
Infections. 
Per 100 
persons. 
German born 
258 
19 
7.36 
English born 
79 
8 
10.13 
Irish born 
424 
58 
13.68 
Other foreign born 
179 
21 
11.73 
The lowest frequency of helminthiasis in foreign-born patients was 
present among those of German birth, the rate of total infection 
among the Germans being lower than that for native white Americans, 
and lower also than the rate reported by any author for Germans in 
their own country (see table, p. 65) . Patients of English nativity gave 
a somewhat higher frequency of infection than did native Americans, 
but a lower rate than the average percentage of infection among all 
foreign-born persons examined. The high rate of infection among 
patients of Irish nativity exceeds even that found among American 
negroes and was evidently responsible, in the most part , for the greater 
frequencv of intestinal worms among Americans of foreign than of 
native'birth. 
TCe were unable to discover in our statistics any evidence of a spe- 
cial predisposition on the part of one nationality to infection with any 
particular species of intestinal worm. 
It is interesting to note the difference in the prevalence of helmin- 
thiasis between the two sexes in the three nativities most largely rep- 
resented, namely, German, English, and Irish. From the following 
figures it will be seen that while among patients of German and of 
Irish birth the rate of total infection was about 9 infections per 100 
persons higher among females than among males, among the English- 
born patients the reverse obtained, the males having given a rate of 
infection- nearly 5 infections per 100 persons in excess of the rate 
present among females : 
