35 
Examined. 
Infections. 
Per 100 
persons. 
A scar is lumbricoides : 
Under 1 year 
626 
6 
0.96 
1 to 3 years 
858 
2 
0.23 
4 to 8 years 
737 
4 
0.54 
9 to 15 years 
445 
0 
0.00 
Over 15 years 
585 
1 
0.17 
Strongyloides stercoralis: 
Under 1 year 
626 
0 
0.00 
1 to 3 years 
858 
3 
0.35 
4 to 8 years 
737 
1 
0.14 
9 to 15 years 
445 
0 
0.00 
Over 15 years 
585 
• 4 
0.68 
Hymenolepis nana : 
Under 1 year 
626 
0 
0.00 
1 to 3 years 
858 
1 
0.12 
4 to 8 years 
737 
3 
0.41 
9 to 15 years 
445 
1 
0.22 
Over 15 years 
585 
0 
0.00 
Txnia saginata: 
Under 1 year 
626 
0 
0.00 
1 to 3 years 
858 
1 
0.12 
4 to 8 years 
737 
0 
0.00 
9 to 15 years 
445 
1 
0.22 
Over 15 years 
585 
0 
0.00 
The rate of infection with whipworms is thus seen to have varied 
in the different groups in practically the same manner as did the rate 
of total infection. Pin worms progressively increased in frequency 
with increasing length of institutional life, the only exception being 
the very slight excess of infection (0.25 infections per 100 persons) 
among patients of 9 to 15 years’ hospital residence over the infection 
present among patients in the last group. The rate of infection with 
hookworms progressively decreased from over 2 infections per 100 
persons in the first group to 0 infection in the last group. The eelworm 
showed a higher percentage of infection among persons of a compara- 
tively short hospital residence, though its distribution among the dif- 
ferent groups of patients was irregular. The irregular distribution 
and the small number of infections with Cochin China worms, with 
dwarf tapeworms, and with fat tapeworms make it impossible to 
detect any special relation between the prevalence of these parasites 
and the length of institutional life. 
