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2. Wu, H., Sah, P. P. T., and Li, C. P., Proc. Soc. Exp. Biol., N.Y., 28, 737 (1929); cf. also the use of antigens containing both iodine and arsenic (Haurowitz, F., and Schwerin, P., J. Immunol., 47, 111 (1943)).
3. Hooker, S. B., and Boyd, W. C., J. Immunol., 30, 33 (1936).
4. Wu, H., Cheng, L. H., and Li, C. P., Proc. Soc. Exp. Biol., N.Y., 25, 853 (1929).
5. Boursnell, J. C., Dewey, H. M., Francis, G. E., and Wormall, A., Nature, 160, 339 (1947).