CONTENTS. 
1J1 
Art. XX. On the Difference between the Land and Sea Rates 
of Chronometers,, deduced from the Register ' 
kept on board his Majesty’s Ship Leven, in two 
Voyages to the Cape de Verd Islands. By Lieute- 
nant Mudge, R. N. - - 378 
XXI. On the Magnetic Influence of the Islands of St Mayo 
and the Great Salvage. By Lieutenant W. 
Mudge, R. N. - - - 381 
XXII. Experiments and Observations on the Effects pro- 
duced on the Rates of Chronometers, by the 
proximity of Iron Bodies. By J. Barlow, Esq. 381 
XXIII. Proceedings of the Royal Society of Edinburgh. 
(Continued from Voh IV, p. 425.) - 385 
XXIV. Scientific Intelligence, - - 387 
1. NATURAL PHILOSOPHY. 
Astronomy. 1 . On the Phases of the Comet of 1 8 1 9- 2. No- 
tice respecting Venus, - - 387 , 388 
Optics. 3. On the Phosphorescence of Marine Animals. 
4. On the Phosphorescence of the Lampyrus noctiluca 
and splendidula, - - 388-390 
Acoustics. 5. Velocity of Sound. 6. Propagation of Sound 
in Elastic Fluids, - 390 
Electricity. 7« Singular Electrical Phenomena observed in 
Switzerland, - - - 391 
Electro-Magnetism. 8. Experiments of M. Yelin on Elec- 
tro-Magnetism. 9- Experiments of M. Bockman on the 
intensity of Magnetism produced by Electricity, 391-394 
Meteorology. 10. Mean Temperature at Carbeth for the 
years 1817, 1818, 1819, 1820. 11. Quantity of Rain that 
fell at Carbeth in the years 1815 to 1820. 12. Gelatinous 
Meteor at Amherst in Massachussets. 13. Singular Ap- 
pearance of Snow and Hail, - - 394-396 
ii. chemistry. 
14. Daniell’s New Platinum Pyrometer for High Tempera- 
tures. 15. Results obtained by Mr Daniell’s New Pyro- 
meter, - - - 897, 398 
III. natural history. 
Zoology. 16. Sword-fish cast ashore at Kirkbean, 
399-401 
