464 Philippine Journal of Science 
Of 529 prisoners receiving ox-gall treatment in the cholera brigade, 
120, or 23 per cent, became repeaters. Of this number, 68, or 13 per 
cent, were returned as repeaters from the cholera brigade as follows: 
Following first ox-gall treatment, 21 or 31 per cent. 
Following second ox-gall treatment, 42 or 62 per cent. 
Following third ox-gall treatment, 5 or 7 per cent. 
It will be seen from this that the administration of bile would 
seem to be helpful in the detection of chronic carriers. 
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