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JMMUNOLOGICAL METHODS OF DIAGNOSIS 



connection is guarded by a glass tube, the whole being sterilized 

 by dry heat (see Figs. 19 and 20). 



jm ampoule; R, rubber tubing: N. needle; B, apparatus assembled ready for use; 

 T, glass protecting tube; D, assembled for sterilizing. 



Thrusting the needle into the vein, while making traction on the skin to fix the vessel 



The skin at the bend of the elbow is cleansed with alcohol, the 

 veins constricted, and the most prominent one punctured. The end 



