116 APPENDIX I. 



be shown by means of the tube of vulcanite belong- 

 ing to the speaker's new myographion. The nerve, 

 inside the tube and between the two pairs of elec- 

 trodes, rests on a varnished copper-plate, which 

 forms part of a small vessel, lodged in the wall of 

 the vulcanite tube. Through this vessel water of 

 any temperature may be passed. By thus cooling 

 the nerve, a wider interval is obtained between the 

 two curves; in fact, this artifice was put into 

 practice in the above-mentioned experiment to make 

 the result more striking. Plates were also exhibited 

 with curves traced on them at a higher and a still 

 lower temperature, thus showing that the horizontal 

 distance of the two curves is in a measure propor- 

 tional to the lowering of the temperature. 



2. Dr. H. Munk, by delicate researches made in 

 the speaker's laboratory, has succeeded in demon- 

 strating that the velocity of the nervous agent is not 

 the same in different parts of the same nerve. Ac- 

 cording to him, this velocity in the motor nerves 

 increases as the nerve approaches the muscle.* 



3. Professor v. Bezold, also in the speaker's 

 laboratory, has undertaken to answer the question 

 whether and how the velocity of the nervous agent 

 may be altered by the electrotonic state of the nerve 

 as sixteen years ago the speaker ventured to term 

 the remarkable condition into which he found the 

 whole nerve thrown when any part of it is pervaded 

 by an electric current; a condition making itself 

 manifest by a most striking change in the electromo- 



* Keichert's tmd du Bois-Keymond's Arcliiv. fur Anatomic, 

 u. s, w., 1860, S. 798. 



