APPENDIX I. 



ON THE TIME REQUIRED FOR THE TRANSMISSION 



OF VOLITION AND SENSATION THROUGH 



THE NERVES. 



A LECTURE GIVEN AT THE EOYAL INSTITUTION, 

 BY EMIL DTI BOIS-REYMOND, 



Professor of Physiology in the University of Berlin. 



Introduction. The speaker first pointed out a certain 

 similarity of action between the nerves and tele- 

 graph-wires. Just as little as telegraph-wires, do 

 the nerves betray by any external symptom that 

 any or what news is speeding along them ; and, like 

 those wires, in order to be fit for service, they must 

 be entire. But, unlike those wires, they do not, 

 once cut, recover their conducting power when their 

 ends are caused to meet again ; in fact, every injury 

 by which the organic structure of the nerve is im- 

 paired, such as bruising it between the blades of a 

 forceps or by a ligature, or burning it, or corroding 

 it by some chemical substance, will stop the trans- 

 mission of either the influence of the will upon tis 



H 



