Abstract
ABSTRACT As there was a possibility that the potency of tuberculin dilutions deteriorated fairly rapidly even when kept at icebox temperature, fresh dilutions had been made bimonthly in this hospital. The preparation of the dilutions involved expenditure of considerable time and often waste of material as the older solutions were discarded. The keeping quality of tuberculin dilutions is of importance to the practitioner also who needs to use tuberculin but occasionally. As no reference was found in the Quarterly Cumulative Index Medicus to this subject, the activity of tuberculin dilutions has been determined during a period of some three to four years. The weaker dilutions, 1:10,000 and 1:1,000, were examined from time to time but the 1:100 and 1:10 dilutions only at the end of the experiment as they were considered to be more stable than the weaker ones.The dilutions were made in distilled water with 0.2 per cent tricresol
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