38 CLINICAL BACTERIOLOGY AND H^MATOLOGY 



blood. It is rebandaged and rebent, and more blood obtained. 

 If a relatively large amount of blood is required (as in the 

 Wassermann test) it is a good plan to soak the hand in very 

 hot water before applying the bandage. This process should 

 be learnt, since it is the simplest one by which the practitioner 

 can obtain blood from himself, as is often necessary in opsonic 

 work 



