iv CONTENTS. 
PAGE 
XXVI. Theory of Marine Currents. By M. Basiner, 160 
XXVII. On the Porosity and Colouring of Agates, Calce- 
donies, &. By M. Néeerrartn, : : 166 
XXVIII. An Account of the Mineral-Field between Airdrie 
and Bathgate, and from Bathgate to Edinburgh 
and Leith. By Ropert Baty, Esq., F.R.S.E., 
M.W. Nat. Hist. Society, &c., Mining-Engineer. 
Communicated by the Author, ‘ 4 173 
XXIX. Scientiric INTELLIGENCE :— 
METEOROLOGY. 
1. Destructive Effects of a Water-Spout on the Bredon 
Hill, North Gloucestershire, on Thursday, 3d May 
1849. 2. Fall of Rain in the Lake and Mountain 
Districts of Cumberland and Westmoreland, in the 
year 1848. By J. F. Miller, Esq., 4 181-1838 
MINERALOGY. 
3. Black Oxide of Copper of Lake Superior. 4. On 
Arkansite. 5. Baierine. 6. Notices of American 
Minerals. By Professor C. N. Shepard. 7. Platinum 
and Diamonds in California. 8. Californian Gold. 
9. Arkose. 10. Total Quantity of Lead Ore raised, 
and Lead Smelted, in the United Kingdom, in 1848. 
11. On the Decomposition of Trap-Rocks. By M. 
Ebelmen, : ‘ : f . 3 183-187 
BOTANY. 
12. Flora of the Date Country and Sahara, ; 187 
ZOOLOGY. 
13. Infusoria of the Dead Sea and the River Jordan, 188 
MISCELLANEOUS. 
14, Alleged Burying Alive, 4 . . 188 
XXX. List of Patents granted for Scotland from 22d Sep- 
tember to 22d December 1849, : : 189 
