CONTENTS. Ill 



Page 

 Helena, with a view of determining the Position of the Plane of no de- 

 viation in those places. By Captain J. P. Wilson of the H. E. I. C. 

 Ship Hythe. - - - - 318 



XXXV. Notice respecting the Zoology of the Falkland Islands. By M. 

 Garnot, - - - 324 



XXXVI. On a Remarkable Decomposition of Carburetted Hydrogen by its 

 Rapid Escape from a Portable Gas Lamp. By David Gordon, Esq. 

 Engineer to the London Portable Gas Light Company. - 325 



XXXVII. Notice regarding the Naturalization of the Cochineal Insect in 

 Spain. By M. Bory de Saint-Vincent, - 326 



XXXVIII. ZOOLOGICAL COLLECTIONS, - - 328 



1. Professor Harlan on the Mammalia of North America. 2. Account 

 of a remarkable Extinct species of Beaver. 3. Account of the Rocky 

 Mountain Sheep, - . - 328—331 



XXXIX. DECISIONS ON DISPUTED INVENTIONS AND DISCO- 

 VERIES, - - - 333 

 Professor Leslie's Apparatus for Ascertaining the Specific Gravity of 

 Powders, not invented by him in 1826 ; but by H. Say, Captain of En- 

 gineers in France, in 1797, - - - - - ib. 



XL. HISTORY OF MECHANICAL INVENTIONS AND PROCES- 

 SES IN THE USEFUL ARTS, - - 334 



1. Mode of Heating Water for a Bath. By Edward Deas Thom- 

 son, Esq. - - ib. 



2. Process of Separating Elaine from Oils. By M. Pechet, ib. 



3. On the Steam Navigation of India, - 335 



4. On the Bursting of Steam Boilers. By John Taylor, Esq. ib. 



5. Account of a New Method of Bleaching and Preparing Flax and 

 Tow. By the Rev. T. B. Emmet t, - - 336 



6. Dr Zimmerman's Safety Gun, - - 337 



7. Perkins's Steam- Engine, - . ' ." 333 



8. Method of producing a fine Black Colour. By M. PETrcOLAS, ib. 

 XLI. ANALYSIS OF SCIENTIFIC BOOKS AND MEMOIRS, ib. 



Elements of Chemistry, including the recent discoveries and doctrines 

 of the Science. By Edward Turner, M.D. F.R.S.E. - ib. 



XLI1. PROCEEDINGS OF SOCIETIES, - 340 



1. Proceedings of the Royal Society of Edinburgh, - jj,. 



2. Proceedings of the Cambridge Philosophical Society, • 343 



3. Proceedings of the Society for Promoting the Useful Arts in Scotland, 344 

 XLI1I. SCIENTIFIC INTELLIGENCE, - . 346 



I. NATURAL PHILOSOPHY. 



Astronomy. — 1. Fifth Comet of 1825 in Eridanus. 2. Gambard's Elements 

 of the Comet of 1826, in the Whale. 3. Return of the brilliant Comet of 

 Taurus from the Southern Hemisphere. 4. Comet of August 1826. 5, 

 Comet of October 1826, and its passage across the Sun's Disc. 6. Obser- 

 vations on the Solar Eclipse of November 29th, 1826. 7. Mr Herscheland 

 Captain Sabine on the difference of Meridians of London and Paris, 346 348 



Optics — 8. Fraunhofer on Halos and Parhelia, - ib. 



Electro-magnetism. — 9. Effect of a moving disc on a Voltaic conductor. 



10. On the conducting power of Metals for Electricity, - ib. 



