CONTENTS. 
iii 
Art. XXII. Notice respecting the House, &c. of Copernicus. 
In a Letter from George Harvey, Esq. Member 
of the Astronomical Society, - - 144 
XXIII. Account of a singular Experiment depending on the 
Polarisation of Light by Reflexion. By David 
Brewster, LL. D. F. R. S. L., & Sec. R. S. E. 146 
XXIV. Account of a Free Escapement, with considerable 
reduction of Friction. By Urbain Jurgensen, 
Chronometer-maker to the Danish Navy, & Mem- 
ber of the Royal Soc. of Sciences at Copenhagen, 148 
XXV. On the Formation of Valleys, Bays, and Creeks. 
By the Rev. George Young, M. A. Whitby^ 151 
XXVI. Account of the Eruption of the Old Volcano of 
Eyafjeld Jokkul in Iceland, in December 1821, 155 
XXVII. Analysis of a Paper on the Finite Extent of the At- 
mosphere. By W. H. Wollaston, M.D. V.P.R. S. 157 
XXVIII. Magnetical Observations made at Bushy Heath, near 
Stanmore. By Colonel Beaufoy, F. R. S. Com- 
municated by the Author, - - l6l 
XXIX. Celestial Phenomena, from July 1. to October 1. 
1 822, calculated for the Meridian of Edinburgh, 
Mean Time. By Mr George Innes, Aberdeen, l62 
XXX. Proceedings of the Royal Society of Edinburgh. 
(Concluded from Vol. VI. p. 372.) - l63 
XXXI. Proceedings of the Wernerian Natural History So- 
ciety. (Continued from Vol. VI. p. 374.) l65 
XXXII. Proceedings of the Society of Scottish Antiquaries, l67 
XXXIII. Scientific Intelligence, - - 173 
I. NATURAL PHILOSOPHY. 
Astronomy. 1. Great Comet of 1811. 2. Greenwich Obser- 
vations on Venus and Jupiter, compared v/ith the Tables 
of Lindenau and Bouvard, 3. Longitudes deduced from 
the Solar Eclipse of 7th Sept. 1820. 4. Astronomical Posi- 
tions of Places. 5. Comet of 1821. 6. Supposed Volcanoes 
in the Moon. 7- Perturbations of the New Planets. 8. 
Right Ascensions and Declinations of Juno. 9. Right As- 
censions and Declinations of Vesta. 10. Declinations and 
Meridional Passage of Ceres. 11. New Comet of 1822. 
12. Visibility of the Planet Venus, - - 173-178 
Optics. 1 3. Laws of Polarisation in rectangular Plates of Glass. 
14. FrauenhofeFs Experiments on the Prismatic Spectrum, 
15- Frauenhofer’s Experiments on the illuminating Power 
of the Prismatic Rays. I6. Frauenhofer’s Experiments on 
