CONTENTS. 



PAGE 



Art. I. Life and Writings of Berzelius. By M. P. Louyet, 1 



II. On the Relations of Trap-Rocks with the Ores of Cop- 



per and Iron, and the similarity of the Schalstein 

 of Dillenburg, the Blatterstein of the Harz, and 

 the Gabbro of Tuscany (Continued from vol. xlvi., 

 p. 306;: — 



1. The Relations of Trap-Rocks with Ores of Copper 



and Iron, . . . • • 16 



2. Relations of the Schalstein of Dillenburg, the Blat- 



terstein of the, Harz, and the Gabbro of Tuscany, 1 6 



III. On an Equation between the Temperature and the 



Maximum Elasticity of Steam and other Vapours. 

 By William John Macquorn Rankine, Civil 

 Eno-ineer. (With a Plate.) Communicated by 

 the Author, 28 



IV. Some Remarks on the Clainis to the discovery of the 



Composition of Water. By John Davy, M.D., 

 F.R.S., Lond. and Edin., Inspector-General of 

 Army Hospitals, &c. Communicated by the Au- 

 thor, 42 



V. On the Acid Springs and Gypsum Deposits of the 

 Upper Part of the Silurian System (Onondaga 

 Salt Group). By T. S. Hunt, of the Geological 

 Survey of Canada, ..... 50 



