70 



Art. 1.— K. Fuji 



Fig. 8. Nerve-organ preparation with six 

 pairs of the electrodes. 



VIII. Speed of Propagation of Excitation 

 through the Nerve. 



vSince the time relation can be measured very accm'ately l)y 

 our method, some experiments were made regarding the speed (jf 

 the propagation through tlie nerve-trunk. 



Oscillogram No. C. 5 

 (Plate XXVIII.) shows an 

 experimental result regarding 

 the uniformity of the speed 

 along the nerve-trunk. On 

 an ebonite plate about 1 cm. 

 in breadth, six pairs of electrodes were fixed as shown in the 

 accompanying hgure. The distance between the electrodes in a 

 pair was 1 mm. and the distances l^etween the corresponding 

 points of such consecutive pairs were 5 mm. .V nerve-trunk with 

 a part of an organ Avas laid on this plate along its length and the 

 momentary stimuli were seut to the points on the nerve in the 

 order of 1, 2, 3, 4, 5, and 2, the last one being for the check. The 

 folloAviug numbers were ol)tained on this oscillogram: — 



Taiîle XXVII. 

 Oscillogram No. C. 5. 

 No additional resistance. 

 Tem])erature of the organ : 1 1C» °C. 



* In 5 and 6 the electrodes should have been interchanged by accident, therefore for 

 their values we used the numbers in the last column. 



