CONTENTS. 



Page 

 Art. I. On the Life and Writings of the late Professor Ru- 

 dolphi. By his successor, Professor Mijller of 

 Berlin, ..... 221 



II. Observations upon the Cause which produces the 

 speedy Melting of Snow around Plants. By M. 

 Macedoine Melloni, . . . 242 



III. Notice of a Dioptric Light erected at Kirkcaldy Har- 



bour, with Description of the Apparatus for cut- 

 ting the Annular Lens to the true optical figure. 

 By Edward Sang, Esq., F.R.S.E. Communi- 

 cated by the Society of Arts, . . 249 



IV. Description of an Experiment regarding the falling 



out of the head of the Thigh-bone from the Socket 

 in rarefied air, explanatory of the great prostra- 

 tion of strength experienced during the ascent of 

 lofty mountains. By Professor Wilhelm Weber 

 of Gottingen, .... 254 



V. On an Arrangement in the Construction of the erect- 

 ing of Achromatic Eye-pieces of Spy-glasses, 

 whereby their magnifying power may always be 

 adapted to the state of the atmosphere. By 

 Charles Goring, M.D. Communicated by the 

 Author, ..... 269 



VI. Theory of Granite, and the other massive Rocks, to- 

 gether with that of Crystalline Slate ; proposed in 

 Lectures on Geology, in the University of Chris- 

 tiania in Norway, in the year 1836. By B. M. 

 Keilhau, Professor of Mineralogy. Concluded 

 frcnn page 101, . , . . 263 



