CONTENTS. 



Art. I. Historical Eloge of Alexander Volta. By M. 

 Arago, Permanent Secretary to the Academy of 

 '..y Sciences of Paris, - - - Page 1 



II. Instructions for Observers of the Aurora Borealis,— 

 H their Height, Sound, Periods, Effect on the Mag- 



netic Needle, and Mode of Observation recom- 

 mended, - . - - - 35 



III. On a Fossil Tooth foupd in a Red Sandstone above 



the Coal Formation'in Berwickshire. In a Letter 

 from Dr R. E. Grant, ^o sfsroT ' - 38 



IV. Tlie Rattle-Snake (Crotalus horridus, Linn.) dis- 



armed by the Leaves of the White Ash (Fraxinus 

 Americana, Mich.) Communicated by Judge Wood- 

 ruff to Professor Silwman, - - 43 

 V. A Sketch of the Tertiary Formation tin the Provinte 

 . of Granada. By C Silvbrtop, Retired Brigadier 

 in the Service of H. C M., K. of the R. and O. 

 of Charles III., and F. G. S. With Plates. Com- 

 municated by the Author. (Concluded from Vo- 

 lume XV, p. 377), - - - 45 

 VI. On the Colour of the Atmosphere and Deep Water. 

 By the Count Xavier db Maistrb/ (Concluded 

 from former Volume, p. 359), - ' ^ - 56 

 VII. Geology of the Valley of Oodipoor. By James Har- 

 DiE, Esq. Bengal Medical Establishment, Member 

 of the Asiatic Society, &c. Communicated by the 

 Author. (Continued from Volume XIV, p. 282), 59 

 VIII. Remarks on the Gypsies, '^' -> i ' . 67 

 IX. Electro-Magnetic Ejcperim^nt^.- <5iM»lriunicated by 



the'Aathdr,io'-» io brra.rrjj'n^> ,^«?"'' - 71 



