CONTENTS. 



Pag:e 

 Art. I. Summary of the most important Geoguostical Phe- 

 nomena with which it is necessary to be acquainted 

 in Preliminary Mining- Operations. By the late 

 Frederick Mohs, Councillor of Mines at Vienna, 

 and Knight of the Royal Saxon Order of Civil 

 Merit, . .... 1 



Structure of Granite. Structure of Slate-Rocks. Classes 

 of Rocks. On Formations. Junctions of Rocks. No 

 determinate arrangement of the Primitive and Transi- 

 tion Rocks. Transitions of Rocks. Rocks subordinate 

 to the Slate Series. Beds and Veins. 



II. On the Danish Oyster Banks. By M. Henrik Kro- 



YER, . . . .22 



III. On the Occurrence of a Fossil Bird in the Chalk-Slate 



of the Canton Glarus. By M. Hermann v. M eyer, 27 



IV. On the Influence of the Weather in relation to Dis- 



ease : 1 . Temperature ; 2. Moisture ; 3. Pressure ; 

 4. Electricity, ..... 28 



V. Upon the Colouring- Matter of Red Snow. By R. J. 



Shuttle WORTH, Esq. With a Coloured Plate, 54 

 VI. Report on a Memoir entitled *' Observations on the 

 Marine, Land, and River Mollusca of the Sechelles 

 and Amirantes Islands. By M. Dufo." By M. 

 Blainville, . ... 64 



VII. On the Hair in Man, and the Dermal Covering's of 



Animals, ..... 69 



VIII. On the Lake of Zirknitz in Carniola, . 72 



IX. Notes on some rare Scottish Minerals. By Professor 

 L. A. Necker of Geneva. Communicated by the 

 Author, ..... 75 



