31 
CONTENTS. 
Art. XI. Historical Account of the Discoveries respecting the 
Double Refraction and Polarization of Light, 289 
XII. Sketch of the Distribution of Rocks in Shetland. By 
Samuel Hibbert, M. D. M. W. S. &c. - 296 
XIII. On the Physical Distribution of the Coniferae, and 
their affinity with the Ephedraceae; with Observa- 
tions on the Use of the Bark of the Larch in the 
process of Tamnng Leather. By John Yule, M.D. 
F.R.S. - - - 315 
XIV. Catalogue of the Right Ascension of Thirty-six prin- 
cipal Fixed Stars, deduced from Observations made 
in the Observatory at Konigsberg, from 1814* to 
1818. By Mr William Bessell, - 320 
XV. Determination of the Longitudes and Latitudes of 
Thirty-four places in the Mediterranean. By Mr 
Charles Rumker, - - 322 
XVL Account of a new species of Chronometer, adapted 
to the eye-pieces of Telescopes, for reckoning frac- 
tional parts of a second in Astronomical Observa- 
tions ; invented by M. Breguet, - 323 
XVIL Remarks on Captain Rater’s paper containing experi- 
ments for determining the length of the seconds* 
pendulum in the latitude of London. By Mr Wil- 
liam Watts, - - 325 
XVIII. Notice of Scientific Travellers in Brazil,-— Prince Mo- 
ritz of Nassau, George Margrave, Von Eschwege, 
and Prince Maximilian of Wied-Neu-Wied. By 
Professor Jameson, - - 337 
XIX. Account of the Method of Colouring Agates. By 
John MacCulloch, M. D. M. G. S. &c. - 341 
XX. Account of some important Discoveries in Magnetism, 
made by P. Barlow, Esq. - 344) 
XXL Account of the Revolving Steam-Engine, invented by 
Mr Samuel Morey, - .t 348 
XXH. Geognostical Description of the Neighbourhood of 
Edinburgh. By Professor Jameson, - 352 
XXni. Experiments on the Effect of the Pressure of the Sea 
at great Depths, in augmenting the Specific Gra- 
vity of different kinds of Wood. By William 
ScoRESBY jmiior, F. R. S. E. &c. - 363 
XXIV. Sketch of a Journey through Brazil in 1817 and 1818. 
By Mr Swainson of Liverpool, - 36g 
