i CONTENTS. 



PAGE 



VI. Gutta Percha. By Thomas Oxley, Esq., A.B., 

 Senior Surgeon of the Settlement of Prince of 

 Wales Island, Singapore, and Malacca, . . 286 



Properties of the Gutta, 290 



VII. On the Use of Gutta Percha in Electrical Insulation. 

 By Michael Faraday, F.R.S., Foreign Asso- 

 ciate of the Academy of Sciences, &c., . .295 



VIII. Communications respecting Scandinavia. In a Let- 

 ter from Herr Karl Bruner Jun., to Professor 



Studer 297 



On the Metamorphoses of Rocks, . . 298 



On the Erratic Phenomena, .... 304 



IX. On the Use of the Marine Hydrometer. By George 

 Buchanan, Civil Engineer, F.R.S.E., President 

 of the Royal Scottish Society of Arts. Commu- 

 nicated by the Royal Scottish Society of Arts, 307 



X, On the Normal presence of different Metals in the 



Human Blood, 309 



XI. On procuring Crystallisations in the Dry Way, as 

 explained in a Memoir laid before the French 

 Academy of Sciences, and reported on by MM. 

 Beud.-vnt, Berthier, and Dufrenoy. By M. 

 Ebelmen, . . . . . .311 



XII. Zoological Researches. By Professor Agassiz, 316 



XIII. Topography of the Pennine Alps, and Primitive Site 



of the Pi'incipal Species of Rocks found in an er- 

 ratic state in the Basin of the Rhone. By M. A. 

 GuYOT. Communicated by the Author, . 319 



XIV. On Shooting Stars. By Sir J. W. Lubbock, Bart., 330 



XV. Further Progress of Mr Jameson's great Tea-Plant- 

 ing Operations in India, under the Patronage and 

 Direction of the Honourable The East India Com- 

 pany, 332 



