1. Bolton, B., Carmichael, A. E., and Stiirup, G. (1936). J. Physiol, 86, 83.
2. Carmichael, E. A., Honeyman, W. M., Kolb, L. C., and Stewart, W. K. (1941). Ibid., 99, 329.
3. Cravener, E. K. (1936). New York State J. Med., 36, 815.
4. Delorme, C. (1917). Bull. Acad. Med., 77, 577.
5. Doupe, J. (1943). J. Neurol. Psychiat., 6, 94.