68 
The Philippine Islands (0.6 per cent), Porto Pico (0.8 per cent), 
British Central Africa (1.30 per cent), and our own (0.23 per cent) are 
the only localities from which statistics could be obtained for Strongy- 
loides stercoralis , and, except the 0.35 per cent of infections found 
among our own cases, Cima’s report of 6.36 per cent among 110 chil- 
dren examined in Italy are the only exact figures available for the 
dwarf tapeworm, Hymenolepis nana. 
The two species of Tsenia ( T. saginata and T. solium), while never 
present in a high proportion of cases, are widely distributed and 
fairly constant, the percentage varying from 0.06 to 3.66 for the beef 
tapeworm and from 0.02 to 3 for T. solium. The latter a is seen to be 
almost invariably the rarer of the two worms. 
It would appear as if the prevalence of hookworms, of Strongyloides 
stercoralis , of Dibothriocephalus latus, and of Hymenolepis nana is 
governed largely by local conditions, and that these parasites tend to 
a high degree of frequency in more limited areas, while Trichuris, 
Oxyuris, Ascaris, and the two Tsenise seem to be practically of world- 
wide and comparatively even distribution. 
We have found other statistical references to the frequency of hel- 
minthiasis in different localities which are not included in Table 2. 
Among them are the following : 
Rcederer, 6 Gottingen, Trichuris, 13 persons examined, 6 (46.15 
per cent) infected; Cooper, 5 Greenwich, Trichuris, 16 persons exam- 
ined, 11 (68.75 per cent) infected; Bellingham, 0 Dublin, Trichuris, 
29 examined, 26 (89.65 per cent) infected; Erni, d Malayan Archipelago, 
Trichuris, 30 persons examined, 24 (80 per cent) infected; Vix, Hop- 
heim Asylum, 86 insane patients examined, 40 (46 per cent) infected 
with Trichuris, h 56 (60 per cent) infected with Oxyuris / 18 (21 per 
cent) infected with Ascaris/ Ascaris present also in 8 per cent of sane 
persons examined; Vitaly Constantine, Ascaris, 1 in 7 of the natives 
and 1 in 33 of the Europeans infected; Sandwithy hookworms, 3.3 
per cent of the population infected in Upper Egypt, 6.2 per cent in 
Lower Egypt, 13.9 per cent in Menonfieh; Zinn and Jacoby/ West 
Africa, 23 negroes examined, 21 infected with Agchylostoma duodenale, 
8 with Trichuris, 8 with Ascaris, 4 with Strongyloides , and 4 with 
Tsenia ; Zaeslein, Bale, 752 autopsies, 178 (23.7 per cent) infected 
with Trichuris , b 86 (11.4 per cent) infected with Ascaris , c and Oxyuris i 
present in 10 of 50 consecutive autopsies (20 per cent); in Paris'* and 
in Southern Italy,* Trichuris has been estimated to be present in from 
50 to nearly 100 per cent of the population; Sommer' found Trichuris 
a In this part of the United States T. 
saginata is the usual large tapeworm found. 
t> Blanchard, 1888a, 783. 
c Bellingham, 1838a, 346-347. 
d Blanchard. 1888a, 785. 
c Blanchard, 1888a, 722. 
/ Blanchard, 1888a, 689. 
9 Blanchard, 1888a, 688. 
h Looss, 1894, 3 footnote. 
* Zinn and Jacoby, 1896, 2 
j Blanchard, 1888a, 724. 
k Braun, 1903, 279. 
I Sommer, 1895, 353-354. 
