43 
15 years of hospital life the remarkably high frequency of 34.69 per 
cent. It is difficult to understand how in the same institution a rate 
of 34.69 per cent of infection should be present among women of over 
15 years’ residence, while the men of like length of residence should 
show only 5.26 per cent; or that the women of such long residence in 
one institution should give 34.69 per cent of infection, while the women 
of another institution, not essentially different in internal arrangement 
or external situation, should give only 7.69 per cent. This high per- 
centage of infection which appears in certain classes of the Connecticut 
women throughout our study is due to the exceedingly great preva- 
lence of Trichuris trichiura found upon and confined to three or four 
female wards at the Connecticut hospital, where the rate reaches as 
high as 40, 50, and in one ward 75 per cent. The amount of infection 
upon these few wards was phenomenal and not even approached by 
any other wards at the Connecticut institution or by any at the Gov- 
ernment Hospital, excepting two wards which, among patients almost 
exclusively soldiers recently returned from the Philippine Islands, 
presented 44.12 and 46.48 per cent of infection. 
It seems, therefore, that the high rate of 34.69 per cent of infections 
with the whipworm is by no means the rate normally present among 
women who have lived 15 years in the Connecticut hospital, but rather 
is an abnormally high rate due to conditions found upon a few heavily 
infected wards (see pp. 53-64). 
It is evident that the apparent influence of institutional life as indi- 
cated in the total figures for all our cases, namely, a decrease in the 
amount of infection for about 6 or 7 years of institutional life and an 
increase thereafter, is but a result of combining patients who, entering 
the hospital with a high rate of infection, tend to gradually lose their 
parasites, and patients of whom comparatively few are infected upon 
admission and among whom the rate of infection tends to rise. 
NATIVITY. 
We were unable to obtain from the hospital records of the patients 
of foreign birth data relative to their length of residence in the United 
States. The nativity of the children at the orphanage was not ascer- 
tained, but the great majority was doubtless of American birth. Our 
comparison with regard to nativity is, therefore, simply between the 
native and foreign born among the adult patients examined. 
There were 215 adults of whose birthplace there was no record. 
Among the remaining 3,1 19 patients the frequency of infection with all 
parasites varied in the native and the foreign born as follows: 
Examined. 
Infections. 
Per 100 
persons. 
Native bom 
2,096 
1,023 
204 
117 
9.73 
11.44 
Foreign born 
