1. 1) Worsae, E.: Z. f. Rassenphysiol., 7, 17, (1935).
2. 2) Matta, D.: Publication No. 11, Faculty of Medicine, University of Egypt, Cairo, (1937).
3. 3) Friedenreicb, V. andWith, S.: Z. f. Immunitatsf., 72, 152, (1933).
4. 4) Hirszfeld, L. andAmzel, R.: Ann. Inst, Pasteur, 65, 386, (1940).
5. 5) Winer, A. S.: Blood Groups and Transfusion. 3rd Edit., Pubs. Thomas, Springfield, U. S. A. (1943).