PROCEEDINGS 



ROYAL SOCIETY OF EDINBURGH. 



SESSION 1855-56. 



CONTENTS. 



Monday, 26tk November 1855. 



PAGE 



On the Occurrences of the Plague in Scotland during the 

 Sixteenth and Seventeenth Centuries. By Robert 

 Chambers, Esq., . . . . 326 



On a Problem in Combinations. By Professor Kelland, 326 



Occul^rence of Native Iron in Liberia, in Africa. From a 

 Letter of Dr A. A. Hayes, Chemist, Boston, U.S., to 

 Professor H. D. Eogers. Communicated by Dr Gre- 

 gory, ..... 327 



Donations to the Library, . . . . 328 



Monday, l^th December 1855. 



Geological Notes on Banffshire. By B. Chambers, Esq., 



F.R.S.E., &c., .... 332 



On the Physical Geography of the Old Bed Sandstone Sea 

 of the Central District of Scotland. By Henry Clif- 

 ton SoRBY, F.G.S. Communicated by Professor Bal- 

 four, ..... 334 



Donations to the Library, . . . . 334 



[Turn over. 



