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Peb. 1920 AMERIC'AN PHARMACEUTICAL ASSOCIATION into paraffined tubes every two minutes. The clotting time of the normal blood was then compared with the clotting time of the samples taken after the coagulant was injected. We found that normal blood clotted in about fifteen to twenty minutes, while after an effective coagulant was injected the clotting time was reduced to four to eight minutes. We found, however, that a few of the preparations on the market instead of increasing thedoi:10.1002/jps.3080090206 fatcat:bthbybxhuzehrmqyxa4noapjii