Action of African B gene on A, subgroup of A.

The action of strong B gene on A1, subgroup of A is demonstrated in a family of 18 individuals. The inheritance of A2BHw and A2BHw is explained. Attention is drawn to these subgroups in parentage studies, especially in Africans.

A study of red cell H-content in Ugandan Africans and Europeans of group O.

The H-content of the red cells of 52 Ugandan Africans and 53 Europeans, all of group O, was measured using agglutination with an extract of Ulex europaeus. There was no appreciable difference between the scores in the two populations.