11 CONTENTS. 



Page 

 XI. On the formation of the Cyanuret of Mercury, and the Sulpho-cyanate 



of Potash. By Edward Turner, M.D. F.R.S.E. Lecturer on 



Chemistry, and Fellow of the Royal College of Physicians, Edinburgh, 245 



XII. Results of a Meteorological Journal kept at Seringapatam during the 



years 1814 and 1816. By Mr John Foggo Junior, - 249 



XIII. Farther Observations on the supposed Optical and Physiological Dis- 



coveries of Mr Charles Bell, ... 259 



XIV. Mean results of Observations with the Thermometer and Barometer at 



Batavia. By M. Uriel, M.D. Communicated by Professor Moll 

 of Utrecht, - • - - 268 



XV. Account of a Survey of the Valley of the Setlej River, in the Hima- 

 laya Mountains. From the Journal of Captain Alexander Ge- 

 rard, Surveyor to the Board of Commissioners, - 270 



XVI. On the relation of the Density of Solid and Fluid Bodies to the size 



of their Molecules, and their affinity for Caloric. By M. Le Cheva- 

 lier Avogadro, .... 288 



XVII. On the Structure of the Eyes of Insects. By Mr William Ewing. 



In a Letter to the Editor, ... 297 



XVIII. Oh Metallic Iron and its Oxides. By F. Strome yer, M.D. F.R.S.E. 



&c. &c Professor of Chemistry in the University of Gottingen, 300 



XIX. Account of the Burning Chasms of Ponohohoa in Hawaii, one of the 

 Sandwich Islands. By the Reverend William Ellis. With a 

 Plate, - - - - 303 



XX. Remarks on the Electric effects of Contact produced by changes of 



Temperature. By M. Becquerel, - - 305 



XXI. On a method of measuring High Temperatures. By M. Becquerel, 316 

 XXII. Description of an Apparatus for producing Intense Light, visible at 

 great distances, invented by Lieutenant Thomas Drummond of 

 the Royal Engineers, - - - 319 



XXIII. Account of the Discovery of a mine of Platinum in Columbia, and of 

 Mines of Gold and of Platinum in the Uralian Mountains. By Baron 

 Alexander de Humboldt, - - 323 



XXIV. Notice of the recent Researches of M. Arago on the Influence of Bo- 

 dies reckoned not Magnetic, on the motions of the Magnetic Needle, 325 



XXV. Abstract of a Memoir on the Theory of Magnetism in Motion. By 



M. Poisson, ... 328 



XXVI. On the Fall of Leaves. By Professor Vaucher of Geneva, 330 



XXVII. HISTORY OF MECHANICAL INVENTIONS AND PRO- 

 CESSES IN THE USEFUL ARTS, - - 339 



1. Account of a Cheap and effectual method of blasting Granite Rock. 



By William Dyce, M. D. F. R. S. Ed. Communicated by the Author, ib. 



2. Description of a Self-Generating Gas Lamp. Communicated by the 

 Inventor, - - - 344 



3. On the Composition of the Mosaic Gold, or Or-Molu, discovered by 

 Messrs Parker and Hamilton, - - - ib. 



4. Account of a Patent Substitute for Leather. Invented by Mr 

 Thomas Hancock, ... 345 



5. Account of an Impro\eraent on Ropes. By Mr Thomas Hancock, 346 



11 



