CONTENTS. 



Pag<s 

 I. Sketch of the Geological Investigations and Writ- 

 ings of Baron Leopold von Buch. By the late 

 Professor Frederick Hoffmann of Berlin, 205 



II. On the Chemical Constitution of Sillimanite. By 

 Arthur Connell, Esq., F.R.S.E., and Profes- 

 sor of Chemistry in the University of St An- 

 drews. Communicated by the Author, . 232 



III. Description of a Species of Skate new to the Bri- 



tish Fauna. By John Fleming, D.D., Profes- 

 sor of Natural Philosophy in the University and 

 King's College of Aberdeen. With two Plates. 

 Communicated by the Author, . . . 236 



IV. On the Animalcules of the Red Snow. By Dr C. 



VoGT, 239 



V. On the Action of Waves at great Depths. By M. 



SiAU, Civil Engineer, . . . ; 245 



VI. Report on the Collections and Geological Obser- 

 vations, made in 1838 and 1839* during the 

 French Northern Nautical and Scientific Expe- 

 dition. By M. Eugene Robert, one of the 

 Members of the Expedition, . . . 247 



VII. Notice of the Principal Traces left by the last 

 great Revolution which took place in the Moun- 

 tainous Countries of Scandinavia. By M. W. 



BOHTLINK, 263 



VIII. Description of Vespertilio Daubentonii, from Spe- 

 cimens found in Aberdeenshire. By William 

 MacGillivrat, A.M., M.W.S., &c., Professor 



