13 
RACE. 
Whites and negroes were represented among our cases. The 123 
children examined at the orphanage were of white race, and in the 
absence of children among the negroes examined it is obviously better 
to exclude the white children in order that the whites and negroes 
compared with regard to the relative frequency of helminthiasis among 
them may correspond in age. 
The relative frequency of intestinal worms among whites and 
negroes in the total 3,334 adult cases examined was as follows: 
Examined. 
Infections. 
Per 100 
persons. 
White patients 
2,875 
459 
303 
57 
10.54 
12.42 
Negro patients 
A truer comparison between the two races may he made, however, 
if instead of comparing all whites and all negroes among our cases we 
select from each race patients who correspond in other conditions and 
make the comparison between two groups alike in all respects except- 
ing race. 
The negroes were all inmates of the Government Hospital, and 378 
of the 459 had been residents of the District of Columbia prior to their 
admission. Selecting from the white patients at the Government 
Hospital those who were admitted from the District of Columbia, we 
obtain a group of 746 whites at the same institution admitted from 
the same limited locality, showing about the same range of age, dura- 
tion of institutional life, and proportion of males and females as the 
378 negroes. Following are the statistics for whites and negroes 
obtained from these restricted groups: 
Examined. 
Infections. 
Per 100 
persons. 
White patients 
746 
37 
o 4.96 
Negro patients 
378 
47 
a 12.43 
a It may be noted that these 378 selected cases gave practically the same rate of infection(12.43 infections 
per 100 persons) as did the 459 negroes examined (12. 42 infections per 100 persons) . Among the whites, 
however, the percentage of infection among the patients admitted to the Government Hospital from the 
District of Columbia (4.96 infections per 100 persons) is remarkably lower than that for all whites exam- 
ined (10.54 infections per 100 persons) . This is due in part to the exclusion of the Connecticut cases (see 
p. 19 et seq.) , but in a greater measure to the exclusion of patients admitted to the Government Hospital 
with a history of recent military or tropical life (see p. 49 et seq.). 
It is seen that the rate of total infection among the negroes was 
between 7 and 8 per cent in excess of that found among the whites. 
