11 CONTENTS. 



PAGE 



VII. On the Course of Electric Currents on the Earth, and 

 on the Cause of Terrestrial Magnetism. By 

 George A. Rowell. Communicated by the 

 Author, • ' . ■ . . .62 



VIII. Notices of New Localities of Rare Minerals, and Rea- 

 sons for uniting several supposed distinct species. 

 By Francis Alger, Member of the Boston So- 

 ciety of Natural History, of the American Aca- 

 demy of Arts and Sciences, &c., . . 59 



IX. An Experimental Investigation of the Magnetic Cha- 

 racters of Simple Metals, Metallic Alloys, and 

 Metallic Salts. By William Sturgeon, Esq., 

 Lecturer on Natural and Experimental Science, 

 formerly Lecturer on Experimental Philosophy 

 at the Honourable East India Company's Mili- 

 tary Academy, Addiscombe, . . .69 



X. Twelfth Letter on Glaciers ; addressed to Professor 

 Jameson. By Professor J. D. Forbes. With 

 two Plates. 



On the Extraordinary Increase of the Glacier of La 

 Brenva, from 1842 to 1846 — its Motion--^Experimen- 

 tum crucis respecting the Origin of the" Veined Struc- 

 ture," . . . . .94 



XI. Note on certain detached Rocks in Barbadoes, and on 

 the Formation of Agaric Mineral. By John 

 Davy, M.D., F.R.S., Lend, and Edin., Inspector- 

 General of Army Hospitals. Communicated by 

 the Author, . . . .104 



XII. Observations on the Extent and Rate of Changes of 

 Temperature of the Waters in the Estuaries of 

 the Mersey and Clyde. By Mr Ritchie Adie of 

 Liverpool. Communicated by the Author, . 108 



XIII. The Industrial Arts of the Esquimaux. By Rich- 

 ard King, M.D. Communicated by the Ethno- 

 logical Society, . . . .112 



