430 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



Furthermore, the studies of isoagglutination phenomena in 

 steers (Ottenberg and Friedman, '11) show that although there 

 are groups of individuals with the same characteristics, some of 

 these groups are different from those in man. In steers the in- 

 teractions seem to involve but one pair of substances distributed 

 in two classes only. The interreactions typical for the various 

 classes in these different animals are given in table 17, in which 

 the differences noted are very apparent. 



TABLE 17 

 In man 



i Sera 



In steers 



The nomenclature and the grouping into classes especially in 

 man are strikingly similar to those given by Correns in respect in 

 the behavior of cross-sterility in Cardamine. In man, however, 

 the incompatibility (judged by agglutination) is assumed to in- 

 volve a reaction between two different substances, while in 

 Cardamine the incompatibility (judged by cross-sterility) is as- 

 sumed, doubtless falsely, to be a relation between two similar 

 substances. No agglutination reactions occur between the bloods 

 of individuals of any class, but in Cardamine only plants of the 

 class "ab" were cross-fertile among themseh'cs. Correns assumes 

 that the substances ma\' be also latciK w hrn they exhibit no 



