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percentage of any tropical labor force. 
Adequate treatment of this latter group is 
necessary, therefore, to maintain its effi¬ 
ciency under conditions of hard labor and 
exposure. Such treatment can be admin¬ 
istered in the field with small personnel 
and little expense. 
11. Non-medical personnel selected from 
camp or village residents can be instructed 
to administer anti-malarial drugs in a 
reasonably satisfactory manner. However, 
a physician qualified and interested in 
tropical and industrial medicine should 
supervise such non-medical personnel, mak¬ 
ing visits at least once a week to the areas 
under treatment. 
12. We consider quinine sulphate and 
atabrine to be of equal therapeutic value 
in the treatment of malaria. In our work, 
atabrine has the advantage that it is pre¬ 
ferred to quinine by the native population. 
It is, of course, considerably more expensive 
than an equivalent course of quinine treat¬ 
ment. We do not believe that plasmochin 
has played a very important role in our 
work. 
