242 



Buchanan 



to 2 on the scale. Fig. 10 B gives the same evidence as fig. 6 B, that the 

 first few shocks produce ettects which outlast them by a longer time than 

 the later shocks, and that between the successive effects, when these are 

 each short, there is an interval during which there is little or no difference 

 of potential between the leading-ofi' contacts. Owing, however, to the 



Fig. 10. 



strong positive after-efi'ect (relative distal negativity) at the end of each 

 individual response, the absence of a fresh change at the proximal contact 

 is denoted not by the meniscus being at rest as it was in the intervals 

 when fig. 6 B was recorded, but by its striving to return to its zero position 

 in the way which it eventual]}' does when all stimulation has ceased. 



REFEREXCES. 



(1) Piper, Arcli. f. d. ges. Physiol., vol. cxix., pp. 301-338, 1907. 



(2) Piper, Zeitschr. f. Biol, vol. 1., pp. 393-420, 1 908. 



(3) Piper, Z. f. Biol, pp. 504-517, 1908. 



(4) Buchanan, Journ. Physiol., vol. xxvii., pp. 95-160, 1901. 



(5) Burdon-Sandersox and Buchanan, Proc. Physiol. Soc, July 1902 ; Journ. 

 Physiol., vol. xxviii. 



(6) Garten, Abb. d. .siicbs. Ges. f. "Wissenscb., matb.-pbys. Klasse, vol. xxvi., 

 pp. 331-414, 1901. 



(7) v. Kkies, Arcb. f. (Anat. u.) Physiol., 1884, pp. 337-371. 



(8) V. Kries, op. cit., 1895, pp. 130-141. 



(9) EiNTHOVEN, Annal. d. Physik (4), vol. xxi., pp. 483-700, 190G. 



(10) Buchanan, this Journal, vol. L, pp. 1-66, 1908. 



(11) Wkdensky, Arch, de Physiol, norm, et path. (5), vol. iii., 1891. 



(12) BoNHOFFER, Arch. f. d. ges. Physiol., vol. xlvii., pp. 125-146, 1890. 



