CONTENTS. 
XIV. An account of experiments to determine the times of vibration 
of the Pendulum in different latitudes. By Captain Edward 
Sabine, of the Royal Regiment of Artillery , F. R. S. and 
F. L. S. p. 1 63 
XV. Some Observations and Experiments on the Papyri found in 
the ruins of Herculaneum. By Sir Humphry Davy, Bart . 
P. R. S. p. 191 
XVI. Observations on Naphthaline , a peculiar substance re- 
sembling a concrete essential oil , which is apparently produced 
during the decomposition of coal tar, by exposure to a red heat. 
By J. Kidd, M. D. Professor of Chemistry , Oxford. Com- 
municated by W. H. Wollaston, M.D. F.P.R.S. p. 209 
XVII. On the aberrations of compound lenses and object-glasses. 
By J. F. W. Herschel, Esq. F. R. S. p. 222 
XVIII. An account oj the skeletons of the Dugong, two-horned 
Rhinoceros, and Tapir of Sumatra, sent to England by Sir 
Thomas Stamford Raffles, Governor of Bencoolen. By Sir 
Everard Home, Bart. V . P. R. S. p. 268 
XIX. On the mean density of the Earth. By Dr. Charles 
Hutton, F. R. S. p. 2 j6 
XX. On the separation of Iron from other metals. By J. F. W. 
Herschel, Esq. F. R. S. p. 293 
XXI. On the re-establishment of a canal in the place of a portion 
of the Urethra which had been destroyed. By Henry Earle, 
Esq. Surgeon to the Foundling, and Assistant Surgeon to St. 
Bartholomew’s Hospital. Communicated by the President. 
p. 300 
