CONTENTS. iii 
Art. XXIII. Account of the remarkable Depression of the Ther- 
mometer, and Rise of the Barometer in Jan. 1820, 835 
XXIV. On Steam, and the Sediment of Water found in the 
Boilers of Steam Engines. By Robert Bald, Esq. 
F. R. S. E. Communicated by the Author, 340 
XXV. On the Absorption of Polarised Light by Doubly 
Refracting Crystals. By David Brewster, LL. D. 
F. R. S. Lond. and Edin, - 
XXVI. Account of the Manufacture of Mosaic at Rome, and 
■ History of the Antique Marbles, Alabasters, &c. at 
Rome. ByW.A. Cadell, F.R.S.L. &E., M.W.S. 348 
XXVII. Abstract of Experiments on the Specific Gravity, 
Temperature, and Saline Contents of Sea-Water, 
&:c. By Alexander Marcet, M. D. F. R. S., &:c. 356 
XXVIII. On the Formation of Sugar from the Sawings of 
Wood, Old Linen and Paper. By M. Braconnot, 363 
XXIX. A very Concise, yet strictly Accurate Method, for 
finding the Interest of any given Sum, at any gi- 
ven Rate, for any given Number of Days. By 
Henry Goodwyn, Esq. Blackheath, Kent. In a 
Letter to Dr Brewster, - 365 
XXX. Account of a Meteorological Journal for 1819^ kept 
at Kinfauns by the Rev. Robert Gordon. In a 
Letter to Dr Brewster, - 369 
XXXI. Quarterly Abstract of the Diurnal Variation of the 
Needle. By Colonel Beaufoy, F. R. S. 373 
XXXII. Proceedings of the Royal Society of Edinburgh, ib, 
XXXHI. Proceedings of the Wernerian Natural History So- 
ciety, - - 377 
XXXIV. Scientific Intelligence, - 378 
I. NATURAL philosophy. 
Astronomy. 1. Obliquity of the Ecliptic. 2. Aberration of 
Light. 3. Transparency of the Comet of 181 9 . 4. New 
Comet." 5. Solar Eclipse of the 7th September 1820. 
6. Astronomical Society in London, - 378, 379 
Optics. 7. Harmotome 8. Meionite. 9. Petahte, 380 
Magnetism. 10 . Variation of the Needle at Lyons, ib. 
Meteorology. 11. Red Rain. 12. Black Rain and Storm 
at Montreal. 13. Snow in Rome. 14. Mean Temperature 
of the Year,, - - 381, 382 
II. chemistry. 
15. Saussure's Experiments on the Decomposition of Starch. 
16 . Phosphoric Acid in Vegetables. 17* New Differential 
