APPENDIX 311 



performed so rapidly that no fluid to prevent coagulation 

 need be added. 



Two technical procedures can be carried out to guide the 

 operator in the quantity of blood to be transfused. One of 

 these is the estimation of the haemoglobin percentage of the 

 blood of the recipient from time to time during the operation, 

 and the other is noting the coagulation time of the blood. 

 Many methods have been employed for the determination of 

 the coagulation time, that of Dorrance {Am. Jour. Med. Sc, 

 Oct., 1913) being accurate and practical, 



