11 
CONTENTS. 
Art. X. On Preserving Fish by Sugar. In a Letter to Dr 
Brewster from J. MacCulloch, M.D. F.R.S. &c. 242 
XL Account of the Memoires de la Societe de Physique et 
, ^ d’Histoire Naturelle de Geneve, - 243 
XIL Meteorological Observations made at Port Antonio, on 
the North Coast of Jamaica, 1819 and 1820. By 
William Arnold, M. D. Member of the Wernerian 
Society, - - - 255 
XIII. Account of the Natron Lakes of Hungary, of the 
Pitchstone of Tribisch in Saxony, and the Minera- 
logical School of Freyberg. By J. S. Beudant, 
Chevalier of the Legion of Honour, &c. &c. 259 
XIV. On Machinery for Calculating and Printing Mathe- 
^ matical Tables. By Charles Babbage, Esq. F. R. S. 
Lond. & Edin. &:c. - - 274 
XV. Notice respecting Mr Barlow’s Discovery of the Ma- 
thematical Laws of Electro-Magnetism, - 281 
XVI. Observations on the Natural Family of Plants called 
Polemoniaceae ; with Descriptions of the Genera 
belonging to it, and of a Genus improperly referred 
to that Order by Botanists. By Mr David Don, 
Curator of the Lambertian Herbarium, - 283 
XVII. On the Method of Minimum Squares, employed in 
the Reduction of Experiments, being a Translation 
of the Appendix to an Essay of Legendre’s, entitled, 
" Nouvelles Methodes pour la Determination des 
Orbites des Cometes,” with remarks. By George 
, Harvey, Esq. Member of the London Astronomi- 
cal Society, - - - 292 
XVIII. On the Methods of separating Lime from Magnesia. 
By C. Daubeny, M. D. M. G. S. (Concluded from 
p. 123.) - - - 302 
XIX. Account of the Jeffersonite, a new Mineral discovered 
at the Frankline Iron- Works, near Sparta, New 
Jersey. Described and analysed by William H. 
Keating, Member of the Wernerian Society, 317 
XX. Description of a New Reflecting Telescope. By Da- 
vid Brewster, LL. D. F. R. S. L. & Sec. R. S. Ed. 323 
XXL On the Physiology of the Root in Plants. By John 
Murray, Esq. F.L.S.,M.G.S., & M.W.S. Lecturer 
on Chemistry. Communicated by the Author, 328 
XXII. Account of a Whirlwind at Roseneath in Dunbarton- 
shire. By James Smith, Esq. of Jordanhill, F. R. S. E. 
In a Letter to Dr Brewster, « 331 
