1. Dorland’s Illustrated Medical Dictionary, 23rd edition. Philadelphia: W.B. Saunders Co. (1957), p. 746.
2. Bernard, C. Lecons sur les anesthesiques et sur l’asphyxie. Paris: Baillière (1875).
3. Heilbrunn, L.V. Colloid theories of narcosis.In Mecanisme de la Narcose, Paris: CNRS (1951), p. 163.
4. Goldacre, R.J. The action of general anaesthetics on amoebae and the mechanism of the response to touch. Cambridge: University Press, Symp. Soc. Exp. Biol. VI: 128 (1952).
5. Bruce, D. &Christiansen, R. Morphologic changes in the giant amoebachaos chaos induced by halothane and ether. Exp. Cell Res.40: 544 (1965).