In the course of a series of cross agglutinations in order to secure known Group II and Group III serum to keep on hand for grouping individuals for blood transfusions, it became apparent that two systems of designating the four different isohemagglutination groups of men are in use. Few authors1 refer to the two systems, and the author of the older one is seldom mentioned. While the matter is of little practical importance, it may not be without interest to call attention to the two systems of naming the groups.
The older classification since the existence of four groups has been recognized is that of Jansky.2 Among others who follow it are Ottenberg,3 Zinsser,4 Meleney, Stearns, Fortuine and Ferry,5 and Edition 1 of the "Laboratory Methods of the United States Army."6 Here the most common group, the one whose serum is the most agglutinative