1. Clark, F. E., and P. H. Carr: J. Bacter. 62, 1 (1951).
2. Conn, H. J., and I. Dimmick: J. Bacter. 54, 291 (1947).
3. Friedenreich, V.: The Thomsen Hemagglutination Phenomenon. doctoral thesis, Univ. of Copenhagen 1930.
4. Honing, J. A.: Mededeel. Deli Proefsta. Medan 7, 223 (1912).
5. Jensen, H. L.: Proc. Linn. Soc. N. S. W. 59, 19 (1934); 65 543 (1940).