1. A new pair of isoagglutination elements is described occurring in a high percentage of all the four blood groups.

  2. The agglutinin x was found in about 75 per cent of group I sera, and about 60 per cent of group III sera. The agglutinable X was found in about 75 per cent of group II corpuscles and in both of the two group IV individuals examined.

  3. The relation of the isoagglutination elements in the four groups, including the C pair of Guthrie and Huck, may be represented according to the Jansky numbering as follows:

  4. The discovery of the new isoagglutination elements in no way alters the practical status of the four original blood groups.

  5. The X pair seem not to be inherited as Mendelian allelomorphs.

GROUP IGROUP IIGROUP IIIGROUP IV
Serum abx (c) ax (c)  
Corpuscles  AX (C) ABX 
GROUP IGROUP IIGROUP IIIGROUP IV
Serum abx (c) ax (c)  
Corpuscles  AX (C) ABX 

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