118 Proceedings of the Roi/al Suciefj/. 



Art. XII. Proceedings of the Royal Society of London. 



The following papers have been read at the table of the 

 Royal Society since the Christmas vacation. 



January 18, 1821. — An account of the comparison of va- 

 rious British standards of linear measure, by Captain Henry 

 Kater, F.R.S. 



An account of the urinary organs and urine of two species 

 of the genus Rana, byJohn Davy, M.D. F.R.S. 



Jan. 25. An account of a micrometer made of rock crystal, 

 by Mr. George DoUond. 



Feb. 1. — The Bakerian lecture : on the best kind of steel and 

 form of a compass needle, by Captain Henry Kater. 



Feb. S.^Notice respecting a lunar volcano, by Captain 

 Henry Kater. 



Feb. 15. — An account of observations of the eclipse of the 

 sun on the 7th September, 1820, with the equatorial sector 

 belonging to the Radclifte Observatory, by the Reverend Abram 

 Robertson, D.D. Sav. Prof. Astron. 



Feb 22. — A further account of fossil bones, discovered in 

 caverns in the limestone rock of Plymouth, by Joseph 

 Whidbey, Esq. 



March 1. — On the aeriform compounds of charcoal and hy- 

 drogen, with an account of some additional experiments on the 

 gases from oil and coal, by William Henry, M.D. 



March 8. — On the length of the seconds pendulum in dif- 

 ferent latitudes, by Captain Edward Sabine. 



March 15. — Observations on naphthaline, a peculiar sub- 

 stance resembling 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 Anatomy at Oxford. 



March 21. — On the papyri of Herculaneum, by Sir H. 

 Davy, bart. P.R.S. 



March 28. — On the aberration of compound lenses and ob- 

 ject glasses, by J. F. W. Herschel, Esq. 



An account of the skeleton of the Dugong, by Sir E. Home, 

 Bart. 



