CONTENTS. 



PAGE 



Art. I. Biography of M. D'Aubuisson de Voisins, Engineer- 

 in-Chief and Director of Mines. By M. De 

 BoucHEPORN, Mining Engineer. (Continued fi-om 

 p. 16), 205 



II. On the Sources of the Nile in the Mountains of the 

 Moon. By Charles T. Beke, Ph. D., F.S.A., 

 &c. (With a Plate.) Communicated by the 

 Author, 221 



III. Researches into the Effects of certain Physical and 

 Chemical Agents on the Nei'vous System, By 

 Marshall Hall, M.D., F.R.S., Foreign Asso- 

 ciate of the Royal Academy of Medicine of Paris, 

 &c., &c. (With a Plate.) Communicated by the 

 Author. 



Section I. On the Blectrogenic Condition of Muscular 

 Nerves : — 



1. Introductory Observations, .... 252 



2. Precautions — Effects of Dryness — of External Mois- 



ture — of Extent of Contact, . . . 255 



3. The Electrogenic Condition of the Nerves; and its 



Discharge, . . .... 258 



4. Some Collateral Experiments, . . • 265 



