Prehistory of the West Indies.

Electrophysiology of the Heart (McGraw-Hill, New York, 1960 ), p. 323. 19. K. Frank and M. G. F. Fuortes, J. Physiol. London 130, 625 ( 1955 ); , ibid . 131, 424 (1956); , fbid. 134, 451 (1956); W. H. Freygang, Jr., and K. Frank, J. Ge}t. Physiol. 42, 749 ( 1959 ); I. Tasaki, E. H. Polley, F. Orrego, J. Neuro physiol. 20, 374 ( 1954); P. Fatt, ibid . 23, 61 (1957). 20. J. S. Coombs, J. C. Eccles, P. Patt, J. Physiol. Londo} 130, 291 ( 1955 ) . 21. D. R. Curtis and J. C. Watkins, J. Neurochem. 6, 1 17 ( 1960 ); D. R. Curtis, J. W. Phillis, J. C. Watkins, J. Physiol. London 150, 656 ( 1960 ) * D. R. Curtis and J. C. Watkins, in Inhibition fn the Nervous System and Gamma Amino Butyric Acid, E. Roberts, Ed. (Pergamon, New York, 1960), p. 424; D. R. Curtis, Intern. J. Neuropharmacol. 1, 239 (1962); D. R. Curtis and J. C. Watkins, J. Physiol. Lo}don 166! 1 ( 1963 ) . 22. D. R. Curtis, J. W. Phillis, J. C. Watkins, J. Physiol. London 158, 296 ( 1961 ) . 23. J. Robbins, ibid. 148, 39 (1959); A. Van Harreveld, J. Neurochem. 3, 300 ( 1959 ) . 24. D. R. Curtis and R. M. Eccles, J. Physfot. Londo}t 141, 435 (1958). 25. , ibid., p. 446. 26. B. Renshaw, J. Neurophysiol. 4, 167 ( 1941 ); J. C. Eccles, Arch. Ges. Physiol. 260, 385 ( 1955 ); , Proc. Roy. Soc. London, Ser. B 153, 445 ( 1961 ) . 27. J. C. Eccles, R. M. Eccles, K. Koketsu, J. Physiol. London 126, 524 ( 1954); J. C.Eccles, R. M. Eccles, P. Fatt, ibid. 131, 154 ( 1956); D. R. Curtis, J. C. Eccles, R. M. Eccles, ibid. 136, 420 ( 1957 ) . 28. H. McLennan, Experientia 18, 278 (1962), Synaptic Transmission (Saunders, Philadelphia, 1963 ), p. 98. 29. D. R. Curtis and R. Davis, J. Physiol. Lon don 165, 62 ( 1963 ); D. R. Curtis and J. C. Watkins, ibid . 166, 1 ( 1963 ) . 30. D. R. Curtis and R. Davis, Brit. J. Pharmacol. 18 217 (1962). 31. D. R. Curtis, Pharmacol. Rev. 15, 333 (1963) . 32. R. Spehlmann and H. Kapp, Arch. Ges. Physiol. 274, 37 ( 1961 ); R. Spehlmann, J. Neurophysiol. 26, 127 ( 1963 ); R. Jung, Klin. Woch. 36, 1153 ( 1958 ); r' s in Neuropsychopharmacology, P. B. Bradley, P. Deniker, C. Raduco-Thomas, Eds. (Elsevier, Amsterdam 1959 ), pp. 133-138. 33. K. Krnjevic and J. W. Phillis, Experie}ttia 17, 469 (1961); ibid. 18, 170 (1962); J. Physiol. London 165, 274 ( 1963 ); ibid . 166, 296 ( 1963 ); ibid., p. 328; Brit. J. Pharmacol. 20, 471 (1963). 34. K. A. C. Elliott, R. L. Swank, N. Henderson, Am. J. Physiol . 162, 469 ( 1950 ); F. C. MacIntosh and P. E. Oborin, Abstr. Intern. Physiol. ('ongr., l 9th ( 1953 ), p. 580; J. F. Mitchell, J. Physiol. London 155, 22P (1960); , ibid. 158, 21P ( 1961 ); ibid. 165, 98 ( 1963 ) . 35. A. J. deLorenzo, Bull. Johns Hopkins Hosp, 108, 258 (1961 ); K. Krnievic and A. Silver, J. Physiol. London 165, 3P ( 1963 ) . 36. J. D. Green, M. Mancia R. von Baumgarten, J. Neuro physiol. 25, 467 ( 1962 ); C. Yamamoto, T. Yamamoto, K. Iwana, ibid. 26, 403 ( 1963 ); C. G. Phillips, T. P. S. Powell, G. M. Shephard, J. Physiol. Lond on 168, 65 ( 1963 ); G. M. Shephard, ibid., p.