61 
6, and the 7 remaining infections were distributed in the other 5 wards 
of this section. 
Ward 6 of section 5, therefore, with 11 infections (24.44 per cent) 
with Oxyuris among its 45 patients, while the remaining 41 wards of 
the hospital with 965 patients gave only 15 infections (1.55 per cent) 
rather evenly distributed among them, presents a striking illustration 
of the unequal distribution of infections above noted. It will be 
seen that of the total 26 infections, 18 were in section 5, and 22 were 
in males. 
In the case of Oxyuris infection on section 5, the condition of affairs 
presented seems to be in harmony with our knowledge of the life cycle 
of the parasite and of its direct transmissibility; further, this section 
is distinctly separated from the other sections of the hospital and the 
patients of the various wards of section 5 come into closer contact 
with each other than they do with patients from any other section. 
It may further be noted that in section 4 all 3 cases of pinworm infec- 
tion found among the 102 patients were confined to ward 3, having 
58 patients; this condition gives rise to the suspicion that Oxyuris 
may be spreading in this ward. 
The infections with Trichuris are more generally distributed among 
the wards, but scarcely more equally. No section is free from this 
parasite. The rate of infection on the different sections varied, how- 
ever, from 1.03 to 53.33 per cent, and while 16 wards showed no 
whipworm infections, one ward showed 75 per cent and 3 other 
wards showed 40, 47.61, and 53.33 per cent, respectively. The most 
remarkable congregation of Trichuris infections appeared in sections 
6 and 7. While on no other section did the rate of infection go above 
6.92 per cent, section 6 presented 26.09 per cent and section 7 pre- 
sented 53.33 per cent; and while the highest rate found on any one 
ward in any of the other sections was 19.23 (ward 8, section 3), the 4 
wards of section 6 gave 15, 17.65, 23.53, and 53.33 per cent, and 
the 3 wards of section 7 showed 40, 47.61, and 75 per cent of infection. 
This unequal distribution of Trichuris infections seems to find no 
explanation in the mode of transmission of the parasite. On the con- 
trary, the period of incubation proved experimentally to be demanded 
by the Trichuris egg, before hatching, excludes the possibility of this 
infection being transmitted directly from patient to patient upon a 
ward or in a section of a building, in the same sense as may take place 
in the case of Oxyuris. 
Buildings heavily or lightly infected received the same water supply 
and, in conjunction with the hospital staff, we were not able to discover 
any conditions in the sanitary arrangements in the different sections 
and wards which would in any way account for the very much greater 
prevalence of Trichuris in some than in others. 
With the thought that the factors of sex, age, institutional life, and 
nativity might separately or in combination offer some explanation 
