J v CONTENTS. 



IX. Further Researches on the Voltaic Decomposition of Aqueous and Alcoholip 



Solutions. By ARTHUR CONNELL, Esq., F.R.S.E., . . Page 151 



X. On the Preparation of Paracyanogen in large quantities, and on the Isome- 

 risin of Cyanogen and Paracyanogen. By SAMUEL M. BROWN, M.D. 

 Communicated by Dr CHRISTISON, ..... 165 



XI. On the supposed Progress of Human Society from Savage to Civilized 

 Life, as connected with the Domestication of Animals and the Cultiva- 

 tion of the Cerealia. By JOHN STARK, Esq. F.R.S.E., $c., . 177 



XII. De Solariis in Supracretaceis Italice Stratis repertis. (Tab. II.) Auctore 



JOANNE MICHELOTTI, 211 



XIII. On the Theory and Construction of a Seismometer, or Instrument for 



Measuring Earthquake Shocks, and other Concussions. (Plate III.) 

 By JAMES D. FORBES, Esq., F.R.S., Sec. R.S. Ed., Professor of Na- 

 tural Philosophy in the University of Edinburgh, . . . 219 



XIV. Experimental Researches on the Production of Siliconfrom Paracyanogen. 



By SAMUEL M. BROWN, M.D. Communicated by Dr CHRISTISON, 229 



XV. On the Anatomy of Amphioxus lanceolatus ; Lancelot, YARRELL. (Plates 

 IV., V.) By JOHN GOODSIR, M. W.S., Conservator of the Museum of 

 the Royal College of Surgemis in Edinburgh, .... 247 



PART II. 



XVI. On the Action of Water upon Lead. By ROBERT CHRISTISON, M.D., 

 F.R.S.E., Professor of Materia Medico, in the University of Edin- 

 burgh, .......... 265 



XVII. On the Parasitic Vegetable Structures found growing in Living Ani- 

 mals. By JOHN HUGHES BENNETT, M.D., Edinburgh. Commu- 

 nicated by Dr GRAHAM, 277 



XVIII. On the Ultimate Secreting Structure, and on the Laws of its Function. 

 By JOHN GOODSIR, M. W.S., Conservator of the Museum of the Royal 

 College of Surgeons, Edinburgh, 295 



XIX. On the Quarantine Classification of Substances, with a view to the Pre- 

 vention of Plague. By JOHN DAVY, M.D., F.R.SS. L. $ E., In- 

 spector-General of Army Hospitals, 307 



