1. Block, W. D., and Buchanan, 0. H. (1940). J. biol. Chem., 136, 379.
2. Block, W. D., and Buchanan, 0. H. (1942). J. Lab. clin. Med., 28, 118.
3. Block, W. D., and Buchanan, 0. H. and Freyberg, R. H. (1941). J. Pharmacol., 73, 200.
4. Block, W. D., and Buchanan, 0. H. (1942). Ibid., 76, 355.
5. Block, W. D., and Buchanan, 0. H. (1944). Ibid., 82, 391.