S. T. Darling 
229 
are known as Khehs, Cantonese, Hylams (Hainan) and Hockians. The new 
comers or “Sinkehs” of course bring with them typical worm formulas of 
their native country. 
“Lowkehs” or men who have returned to Indonesia after a previous visit 
possess formulas altered possibly by previous residence. 
It is not always possible to learn with accuracy a man’s previous residence, 
for the Oriental is very guarded in replying to questions and may have 
reasons for wishing to appear as a hew comer, this being particularly the case 
in Chinese who had been banished for crime. 
At St John’s Island, Singapore, we treated 46 “Sinkehs” and obtained 
1241 hookworms of which 420 were A. duodenale and 821 were N. americanus, 
thus the ancylostome index was 33-8. In this group there were ten cases of 
pure Necator infection yielding altogether 148 worms. 36-9 % of the men had 
indices falling within the group index of 33-8. 
Among the patients treated at the District Hospital, Kuala Lumpur, 
there were 79 Chinese who yielded 5191 hookworms, of these 1994 were 
A. duodenale and 3197 N. americanus , the ancylostome index being 38-4. 
In this group there were 12 cases of pure Necator infection and 37 other 
cases whose indices we?e below the average for the whole group. The men 
had lived in the Federated Malay States for periods up to 20 years and 
possibly to some slight extent represent infection derived from other races. 
On the other hand the index is very close to that of Sinkehs and the index 
38-4 or 33-8 in all likelihood represents a border line or frontier index, where 
the species overlap. 
In five fatal cases of hookworm infection the ancylostome index was 
86*1 %, there having been found 3779 A. duodenale and 698 N. americanus. 
Chinese horn in Indonesia. 
Some data were obtained on the index of Chinese born in Indonesia, few 
cases it is true but very interesting as showing how children of the foreigners 
take up the worm index of the natives of the country. 
Two Straits born Chinese were examined in Kuala Lumpur. One was of 
the first generation, the other of the second generation born in the Malay 
Peninsula. 72 worms were obtained from these young men, all Necator, the 
ancylostome index being nil. 
Among the Chinese treated in the Batavia jail there were two born in 
Java. The man who was born in West Java had 123 hookworms, one of which 
was A. duodenale, a percentage of 0-8, which is a West Java index. The other 
who was born in mid-Java had 57 hookworms of which 11 were A. duo¬ 
denale, giving a percentage of 19-3 which is a mid-Java index. Rather a 
striking illustration of the effect of regional soil in determining the species 
formula. 
The physical resemblances between Malays and Chinese are very strong 
indeed. Wallace observed this in adults and even after having become 
