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two or three days. The usual method of using is to add a small crystal to the urine to be preserved. It is only slightly soluble in the urine, and in my experiments did not prevent the growth of bacteria longer than twenty-four hours. So far as I know thymol does not interfere with any of the tests usually applied to the urine. It, however, cannot be recommended because of its efficiency as a preservative. Carbolic acid, chromic acid, ether, hydronaphthol, and a number of other substances havedoi:10.1056/nejm190506221522503 fatcat:gyrspazqfzcmljrb5e5yyxbpyq