25 
higher rate of infection among older persons. Dwarf tapeworms were 
decidedly more prevalent among the children (under 15 years) than in 
am r group of adults. 
Before attempting to draw any conclusions as to the general signifi- 
cance of the above results obtained from our total number of cases, we 
will consider what further information may be obtained by studying 
the relation between age and the prevalence of intestinal worms 
indicated by the results in the following classes of patients taken 
separately: Males and females, males and females at the Connecticut 
Hospital, white and negro males and females at the Government Hos- 
pital. Only in the first two classes (all males and all females) do we 
have the youngest age group (under 15 years) represented (by the 
orphanage children) ; the patients at the two hospitals all fell in the 
three older groups. 
The total infections among males in the different age groups were 
as follows: 
Years. 
Under 15 
15 to 30.. 
31 to 50.. 
Over 50. . 
Examined. 
Infections. 
Per 100 
persons. 
72 
16 
22.22 
402 
77 
19.15 
865 
90 
10.40 
876 
43 
4.91 
Among the male patients, accordingly, as among males and females 
combined, the rate of infection decreased as we pass from the younger 
to the older age groups. With one exception, however, the rate of 
decrease is greater among males than among patients of both sexes, 
as appears from the following comparison : 
Decrease in the rate of total infection: 
From the first to the second age groups — 100 persons. 
Males and females 5. 41 
Males 3. 07 
From the second to the third age groups — 
Males and females 4. 32 
Males 8.75 
From the third to the fourth age groups — 
Males and females 4. 35 
Males 5. 49 
From the first to the last age groups (total decrease) — 
Males and females * 14. 08 
Males 17.32 
It appears that the total decrease in the rate of infection from the 
first group (patients under 15 years) to the last group (patients over 
50 years) is greater among males alone than among males and females 
together by over 3 infections per 100 persons; furthermore, that the 
decrease is greater among males alone than among males and females 
