io Philippine Journal of Science 1920 
Table 2 . — Incidence of protozoa and helminths. 
Parasite. 
Males. 
Females. 
Cases. 
Spirochxta eurygyrata - ... .. 
33 
28 
61 
"Blastocystis” 
14 
20 
34 
Entamceba coli 
2 
5 
7 
Endolimax nana 
3 
4 
7 
Dicntamcebafragilis 
3 
0 
3 
Trichomonas intestinalis i 
6 
4 
10 
Giardia intestinalis 
7 
1 
8 
Eutrichomastix sp. (?) 
0 
1 
1 
(Jhilo'trmsif.'ijr. 
0 
3 
3 
*'I Cysts” 
1 
2 
'Vrrfdi'iLTi.R tTii^h.iv.TCJ. 
33 
36 
69 
Ascaria lumbricoides 
24 
32 
68 
Hookworm 
4 
8 
12 
Oxyuris vermicularis _ 
1 
0 
1 
parasite in the series. Spirochseta eurygyrata comes next, and 
Ascaris lumbricoides, third. Table 1 has shown the compara- 
tively low incidence of protozoal as compared with helminthal 
infections, a condition we shall discuss farther on. It is to be 
noted that no evidence of either cestode or trematode infection 
was discovered in any case. 
By far the greater number of patients studied resided in 
Manila, only twenty-three having come from the provinces. Ob- 
viously we have dealt with too few cases to enable us to draw 
any conclusion regarding either geographical distribution or the 
incidence of any particular parasite in the several localities. In- 
cidentally, we might remark, however, that previous work has 
shown that the geographical distribution of animal parasites in 
the Philippine Islands is somewhat irregular, the trematodes, 
with the exception of Echinostoma ilocanum, for instance, being 
found in the southernmost provinces only. A thorough bionomic 
study would undoubtedly reveal the reason for this seemingly 
anomalous condition. 
Be that as it may, however, 92.2 per cent of the children 
residing in Manila were found to be infested with parasites. 
Only one child in the provinces was uninfested, thus giving us 
a provincial incidence of 95.2 per cent. This child was 1 year 
old and had always been breast-fed. The locality from which it 
came is not renowned for its sanitation, but the immediate sur- 
roundings of the child were, nevertheless, “clean.” 
We have made careful inquiry into the immediate home sur- 
roundings and habits of these patients and the water drunk by 
them — as to whether it came from wells, the city water supply, 
or some other source. We are led to the conclusion that the 
