' CONTENTS 



EDINBURGH JOURNAL OF SCIENCE. 

 No. XX. . 



Page 

 Art. I. Biographical Sketch of the late Dugald Stewart, Esq. F. R. SS. 



Lond. and Ed. - - - - 193 



II. Notice respecting the existence of Chrysolite in Obsidian, as disco- 

 vered by Professor Del Rio, _ _ - 206 



III. Description and use of a new Gravimeter. By Don Jose Maria 



BUSTAMENTE, . - - - 207 



IV. Notice of the Performance of Steam- Engines in Cornwall for Octo- 

 ber, November, and December 1828. By W. J. Hevwood, Esq. 

 F. G. S., Member of the Royal Geological Society of Cornwall. 

 Communicated by the Author, - - - 213 



V. Observations relative to the Motions of the Molecules of Bodies. By 

 David Brewster, LL. D. F. R. SS. London and Edinburgh, 215 



VI. Remarks on the formation of Anchors. By Commander Johk 



Pearse, R. N. Communicated by the Author, - 220 



VII. Summary of the state of the Barometer, Thermometer, &c. in Ken- 

 dal, for the year 1828. By Mr Samuel Marshall. Communi- 

 cated by the Author, - _ , _ 222 



VIII. Account of the great Congress of Philosophers at Berlin on the 18th 



September 1828. Communicated by a Correspondent, - 225 



IX. A Summary of Experiments recently made on the Temperature of 

 Mines. By W. J. Henwood, Esq. F. G. S., Member of the Royal 

 Geological Society of Cornwall. Communicated by the Author. 234 



X. Physical Notices of the Bay of Naples. No. III. On the District of 

 Pausilipo and the Lago d'Agnano. By James D. Forbes, Esq. 

 Communicated by the Author, ... 245 



XI. Abstract of the Meteorological Register for 1822, 1823, 1824, and 

 1825, from Observations made by the Surgeons of the Army at the 

 Military Posts of the United States Army. Prepared under the direc« 

 tion of Joseph Lovell, M. D. Surgeon-General of the United 

 States Army, .... 267 



XII. Thermometrical Observations made at Raiatea, one of the Society 

 Islands, in 1822. By the Rev. L. E. Threlkeld. Communicated 

 by Mr Dunlop, - - . - . 280 



