218 



Mr. G. J. Burch. On the Interpretation of [Feb. 11, 



the second phase are both due to the development of the 

 electromotive changes, and the end of the first phase and 

 the end of the second phase to their subsidence. Thus a 

 quick development and slow subsidence will be indicated for 

 this class of curve when the end of each phase is more 

 gradual than its beginning. 



It is interesting to compare these results with those 

 obtained by Professor Gotch and myself from Malapterurus.* 



a c 



















1 



























b d 



Fig-. 16. — Diagram of record in which rate of subsidence is slower than rate of 

 development, a = first phase of record ; b, its analysis, c = second phase 

 of record ; d, its analysis. 



Fig. 17 represents the analyses of three single shocks, the first of 

 which was given when the preparation was fresh, and the third just 

 before it ceased to respond to a stimulus. It will be observed that 

 the development of the E.M.F. occupies from one-third to one-half the 

 time required for its subsidence, and that the duration of the maximum 

 is relatively short. 



30 volts. 



r 



20 vo&s. 











>o eotts. 













i 









O-e. O/a. m OZs. -Q3a. -04.3. VSs. 



EiG. 17. — Analysis of three single shocks of piece of electrical organ of Malap- 

 terurus, taken at intervals of several minutes. T = 5° C. No. 3012, leads 

 1*5 cm. apart; No. 3013 ditto, but preparation failing. No. 3017, leads 0'2 cm. 

 apart. Preparation ceased to respond after this. 



* ' Eoy. Soc. Proc.,' vol. 65, p. 439. 



