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The Philippine Journal of Science 
1921 
have had narrow escapes. One cannot dogmatize on the matter, 
but probably it will be found that a large number of these fila- 
riasis cases die of lung trouble in the end. A fair number 
suffer from phthisis, but whether the number is greater among 
them than among the general population, it is impossible to say. 
A certain number of such patients suffer from nephritis, but 
what has just been stated about the proportion of phthisis cases 
holds for these also. 
How is the disease to be dealt with as a whole? 
McNaughton (22) has reported a few cases treated by salvar- 
san, in which if was claimed that the parent worm had been 
killed by the treatment. I am not aware of any special work 
that has been done in this direction in China; but, as has been 
stated previously, the killing of the parent worm, even if it 
can be certainly done, is not altogether devoid of risk to the host. 
The extirpation of the mosquito carrier in southern China is a 
matter of impossibility, but much might be done by a proper 
use of the mosquito net or a screening of the bedroom in which 
the infected person sleeps. But what of the number of patients 
who are infected and do not know it? The whole problem is 
one beset with difficulties, and it must be confessed that the 
mosquito net, with all its drawbacks, is the most practical pre- 
ventive measure at our command at the present time. 
AC KNO WLEDGMENT 
I wish to thank many of my fellow workers in southern China 
for kindly answering queries put to them from time to time as 
well as those who have kindly placed photographs at my disposal. 
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(3) Bancroft, T. L. Journ. Trop. Med. London 2 (1899) 91. 
(4) Bell, L. N. Am. Journ. Gyn. & Obstet. 29 (1919) 199. 
(5) Brazilian Physicians. Diseases of Warm Climates. Pentland, Lon- 
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(6) Calvert, W. J. Johns Hopkins Bull. 13 (1902) 133. 
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