1. Cold Spring Harbor Symposia on Quantitative Biology;Bishop, G.H.,1936
2. Degeneration and Regeneration ofthe Nervous System;y. Cajal, S.R.;London,1928
3. Denny-Brown, D. (1941). Lancet, 1, 371.
4. Dixon, K. C. (1940). Ibid., 2, 360.
5. Gibbs, F. A. (1939). J. Pediat., 15, 749.