contents: 
Art.XXVIII. Notice respecting a Singular Optical Property of 
Tabasheer. By David Brewster^ LL.D. F.R. S, 147 
XXIX. Account of the Expedition to Baffin's Bay, under 
Captain Ross and Lieutenant Parry. Drawn up 
from Captain Ross’s Account of the Voyage, and 
other sources of information, - 150 
XXX. On the Quantity of Saline Matter in the W ater of the 
North Polar Seas. By Andrew Fvfe, M.D. &c. l60 
XXXI. Observations on the Information collected by the 
Ashantee Mission respecting the Course of the 
Niger, and the Interior of Africa. By Hugh 
Murray, F. R. S. E. - « 
XXXIL Notice concerning David Gilbert Tate, a lad Born 
Deaf and Blind in the Shetland Islands. By 
Samuel Hibbert, M. D. M. W. S. &c., » 171 
XXXIII. Proofs that the Beaver was formerly a native of 
Scotland, including an account of some Fossil 
Remains of that animal found in Perthshire and 
Berwickshire. By Patrick Neill, F. R. S. Ed. 
F. A. S. & Sec. W. a - - 177 
XXXIV. Account of the Formation of the Lake of Mauvoi- 
sin, by the Descent of a Glacier, and of the Inun« 
dations of the Vai de Bagnes in 1595 and 1818, 187 
XXXV, Proceedings of the Royal Society of Edinburgh, 191 
XXXVI, Proceedings of the Wernerian Natural History So- 
ciety, - - 196 
XXXVII. Scientific Intelligence, « ^ 198 
I, NATURAL PHILOSOPHY, - ib. 
Astronomy, i. La Place’s Results respecting the Form and 
Structure of the Earth. 2. On the Libration of the Moon. 
S. Error of the Repeating Circle. 4, First Comet of 1818. 
5. Second Comet of 1818, 6. Third Comet of 1818. 7- Cap- 
tain Kater’s Verification of the Latitude of Arbury Hill, 
8. Sir William Herschel’s Researches respecting the Distance 
of the Fixed Stars, 9 Asbestps fibres recommended for 
Micrometers. 10, Experiment shewing that gravity acts 
equally on light and heavy bodies, - - 1 98 — 202 
Optics. 11. Singular Optical Illusion seen in Baffin’s Bay, 
12. Dr Watt’s Theory of the Rainbow, - 203 
Acoustics. 13, Velocity of Sound. 14. Poisson’s Researches 
on Wind Instniments, - gOi, 
