CONTENTS. 
iii 
Art. XXVIL Account of the Discoveries of M. Oersted, re- 
specting the Connection between Magnetism 
and Galvanism, and the subsequent Researches 
of Sir H. Davy, Bart., M. Ampere and M. Biot, 1 67 
XXVIII. Account of the Piezometer, for Measuring the 
Compressibility of Water. By J. Perkins, Esq. 175 
XXIX. Account of Mr Oxley’s Observations on the Va- 
riation of the Needle, &c. in New Holland, 177 
XXX. Reply to a Note in the Annales de Chimie by M. 
Arago, on the Phosphorescence of Fluor-Spar, 1 80 
XXXL Experiments on the Specific Gravity of Sea-Wa- 
ter drawn in different Latitudes, and from va- 
rious Depths in the Atlantic. By Thomas 
Stewart Traill, M! D., F. R. S. E., &c. &c. 185 
XXXII. General View of the Monthly Mean Variation, 
and the Mean Monthly Diurnal Variation of 
the Needle, with Tables of the State of the 
Atmosphere at the time of the Magnetical Ob- 
servations. By Colonel Beaufoy, F. R. S. 188 
XXXIII. Proceedings of the Royal Society of Edinburgh, 192 
XXXIV. Proceedings of the Wernerian Society, - 194 
XXXV. Scientific Intelligence, - 197 
I. NATURAL PHILOSOPHY. 
Astronomy. 1. Observations on the Solar Eclipse of Sept. 7* 
1820. 2. Belzoni’s Observations of the Annular Eclipse of 
the Sun, of the 5th May 1818. 3. Opposition of the New 
Planets Ceres, Pallas, and Vesta, observed by Mr Groom- 
bridge. 4. Obliquity of the Ecliptic, - 197, — I9S 
Magnetism. 5. Effect of Magnetism on the Balance of Chro- 
nometers. 6. Diurnal Variation of the Needle, &c. 199 
Electricity. 7. Experiments in favour of one Fluid. 8. Ex- 
periment in favour of two Fluids, - 199, — 200 
Meteorology. 9- Meteorological Committee for procuring 
Meteorological Journals. 10. On the Cause of Regular Fi- 
gures formed by Hoar-frost on Windows, - 200, — 201 
11, chemistry. 
11. Carbonic Acid, &c. in Sea-Water. 12. Muriate of Potash 
in Rock-Salt. 13. Appparatus for the» Combustion of the 
Diamond, by Mr John Murray, Lecturer on Chemistry. 
14. On the Alloys of Platinum. 15. Fulminating Silver. 
16. Iodine in the Crab and Lobster. 17* Method of re- 
storing the White Colours in certain Paintings, 201, — 203 
