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The ordinary Wright capsule requires considerable skill in filling. The modified form illustrated here in sectional diagram can be readily filled by any one. Sufficient serum for a Wassermann test is more readily obtained than by venipuncture in the hands of one who is not expert in the latter procedure. The capsule is made by closing one end of a piece of glass tubing and drawing out the other to a capillary point and closing the capillary end. The air-tight tube is then held in the flame just below the origin of the capillary end until the heated and expanding air causes a bulging on one side, which finally ruptures with a "pop," leaving a small round hole. After this the capillary end should be broken open. In use, blood flows into the capillary end and trickles down the side to the bottom of the tube, the enclosed air passing
Lyon MW. AN EASILY FILLED CAPSULE FOR COLLECTING BLOOD. JAMA. 1915;LXV(21):1813. doi:10.1001/jama.1915.25810210001017a
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