1. Principles and practice of medicine,';Osler,1922
2. Bradford.-Lancet, Vol. II, pp. 703-706, 1908.
3. Fearnsides.-Brain, Vol. XXXIX, p. 224, 1916.
4. Bramwell.-Edin. Med. Jl., Vol. XXXII, 1886-87.
5. of Nervous and Mental Diseases, Vol;Jl, Weir Mitchell;XVI