.TOURNAI. OF THE COLLEGE OF SCIENCF, IMPEEIAL UNIVERSITY, TÔKTO. 



VOL. XXXVII., ARTICLE 1. 



Researches on the Electric Discharge of the Isolated 



Electric Organ of Astrape (Japanese Electric Ray) 



hy Means of Oscillograph. 



K. Fuji, BigcdtisJii. 



With SO Plates. 



Contents. 



Pare 



T. Tntrodnctioii 1 



If. description of the fisli, and preparatioii of the organ 3 



IIT. Plan of the experiments G 



lY. Fonnnla expressing the discharge curve ] 4 



V. l^elation hetween the form of stimuhis and the discharge caused by it. ... t2G 



YI. Discharge by two successive stimuh 4'.i 



YIT. Fatigue phenomenon 65 



Y ITT. Speed of propagation of excitation through the nerve 70 



IX. Miscellaneous problems 72 



Summary ... 77 



Ai^peiulix. Tables of experimental data and calculated numbers. ... 80 



I. Introduction. 



It is now sonic twenty years since the discharge cni'ves of 

 electric fishes began to be investigated by such physiologists as 

 Gotch, Schcnlein, Garten, Koike, Cremer and others. The 

 method of Gotcli consisted in tracing the curve, point by point, by 

 means of a ballistic galvanometer, a single point being determined 

 by each discharge. Scliënlein apphed Bernstein's rheotome; 

 Garten and Koike used tlie capillary electrometer and tlie string 



