1. Bronfenbrenner, J., Hershey, A. D., and Doubly, J., J. Bact., 37, 583 (1939); Ely, J. O., ibid., 38, 391 (1939); cf. also Miller, B. F., and Baker, Z., Science, 91, 624 (1940).
2. Cook, E. S., and Kreke, C. W., unpublished.
3. Cook, E. S., Kreke, C. W., and Nutini, L. G., Studies Inst. Divi Thomæ, 2, 23 (1938).
4. Cook, E. S., Hart, M. J., and Stimson, M. M., in publication.
5. Weed, L. A., and Ecker, E. E., J. Infect. Dis., 49, 440 (1931); 52, 354 (1933).