26 
together as we pass from the second to the third and from the third to 
the fourth age groups; as we pass from the first to the second group, 
however, there is a greater fall in the rate of infection in the case of 
males and females than in that of males. 
Since we have found, therefore, that the decrease in the rate of infec- 
tion with intestinal worms accompanying an increase in the age of the 
patients is considerably more marked in the results for males than in 
the results for males and females together, it must follow that this 
relation between age and helminthiasis is either absent or considerably" 
less marked among the female patients examined. Before taking up 
the amount of infection at different ages among females, however, we 
may make a further studv of the age statistics found among males by 
considering separately the white and the negro males at the Govern- 
ment Hospital and the male patients (white) at the Connecticut 
Hospital. The data in question are summarized in the following 
table: 
Years. 
Examined. 
Infections. 
Per 100 
persons. 
Total infections among white males at the Government hospital: 
15 to 30 
238 
45 
18.91 
31 to 50 
516 
60 
11.63 
Over 50 
668 
26 
3.89 
Total infections among negro males at the Government hospital: 
15 to 30 
71 
17 
23.94 
31 to 50 
104 
12 
11.54 
Over 50 
56 
l 
12.50 
Total infections among male patients (white) at the Connecticut 
hospital: 
15 to 30 
93 
15 
16.13 
31 to 50 
245 
18 
7.35 
Over 50 
152 
10 
6.58 
Among the white males at both hospitals the rate of infection 
decreased from the younger to the older age groups; the amount of the 
decrease was greater, however, among the males at the Government 
hospital than among those at Connecticut hospital. The negro males, 
on the other hand, while showing a more marked fall in the rate of 
infection than did the white males at either hospital as we pass from 
the second to the third age group, and a more marked total decrease 
than the Connecticut hospital males, presented a slightly higher per- 
centage of infection among patients over 50 years old than among 
those between 31 and 50 years. 
TVhile it has not been thought desirable to enter into a consideration 
of the relative prevalence of each species of parasite at different ages 
among the male patients, since the number of infections with any one 
species in the various age groups would be rather small to give satis- 
factory results, it is worthy of note that while among both the white 
