CONTENTS. 



Art. I. The Life and Writings of Louis Agassiz, Doctor of 

 Philosophy and Medicine, LL.D. of Edinburgh 

 and Dublin, Knight of the Order of the Red Eagle 

 of Prussia, formerly Professor of Natural History 

 in the Academy of Neufchatel, now Professor of 

 Zoology and Geology at Cambridge, in the 

 United States of America, &c., &c., &c., . 1 



II. Researches into the Effects of certain Physical and 

 Chemical Agents on the Nervous System. Bj 

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

 ciate of the Royal Academy of Medicine of Paris, 

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

 thor. (Concluded from vol. xlv., p. 267.) 27 



Section II. On the Electrogenic Condition of the Spi- 

 nal Marrow, and of the Incident Spinal Nerves : — 



1. On the Electrogenic Condition of the Spinal 

 Marrow, ...... 29 



2. On the Electrogenic State of Incident Nerves, 32 



3. On Primary and Superadded Voltaic Circuits, 36 



III. On the Vegetable Colonisation of the British Islands, 

 Shetland, Feroe, and Iceland. By M. Ch. Mar- 

 tins, ....... 40 



