466 



Scientific Proceedings (132) 



produced by acute hemorrhage. The determination of the 

 chylomicrons, therefore, cannot be taken as an index of the total 

 fat in the blood. 



That the chylomicrons are associated with the fats in the blood 

 is confirmed. 



230 (2190) 



A hitherto un described pair of isoagglutination elements in 

 human beings. 



By ARTHUR F. COCA and H. KLEIN. 



[From the Department of Bacteriology and Immunology, Cornell 

 University Medical College and the New York Hospital, 

 New York City.] 



Landsteiner, in 1901, discovered three human blood groups, 

 and soon afterward, Decastello and Sturli, pursuing the study 

 with Landsteiner's knowledge and encouragement, found the 

 fourth group. Landsteiner recognized the existence in human 

 serum of two ischemagglutinins, which were designated with 

 small letters a and b, or (by von Dungern and Hirschfeld) 

 a and ft and two isoagglutinable substances in the corpuscles 

 which were called A and B. 



Quite recently Guthrie and Huck have reported the discovery 

 of a third pair of isoagglutination elements, which, to bring 

 the terminology into conformity with the previously existing one, 

 we will refer to as isoagglutinin c and agglutinable substance C. 



The relation of the exceptional individuals observed by 

 Guthrie and Huck to the original four blood groups is shown 

 in Table I. 



TABLE I. 



Groups I II HI IV 



Serum a. b. b a 



Corpuscles A B A - B - 



Guthrie b e 



and Huck A. C. B 



