CONTENTS. Ill 



Page 

 Art. XXIX. Description of Levyne, a New Mineral Species. By David 



Brewster, LL. D. F. R. S. Lond. and Sec. R. S. Edin. - 332 



XXX. DECISIONS ON DISPUTED INVENTIONS AND DISCO- 



VERIES, .... 334 



1. The Daily Variation of the Barometer not discovered by Colonel 

 Wright. 2. Bryson's Compensation Pendulum, invented by Mr David 

 Ritchie of London. 3. Sir William Congreve's Moveable Ball Clock, 

 invented by M. Serviere. 4. Heulandite first separated from Stilbite 

 by Professor Mohs, and not by Mr Brooke. 5. Mr Nicholas Mill's 

 Platina Pyrometer, ..... 384 — 338 



XXXI. HISTORY Of MECHANICAL INVENTIONS AND PRO- 



CliSSES IN THE USEFUL ARTS, - - 339 



1. Mr Ritchie's Photometer, and the Illuminating Powers of Oil and Coal 



Gas, - - ..... ib. 



2. M. Ducom's Cylindrical Artificial Horizon, - - 341 



3. Mr Jeffrey's Method of condensing Smoke, Metallic Vapours, &c. 342 



4. Casting of Wooden Ornaments and Veneers, - - ib. 



5. Account of the Lapidary's Wheel of the Hindoos, - - ib. 



6. Dr Church's New Boring Auger, - - - 343 

 7- Evans's New Method of Roasting Coffee, - ib. 



8. Braconnot's Process for making Blacking for Leather, • ib. 



9. Mr Jenning's Improved Gas Burner, - - - 344 



XXXII. ANALYSIS OF SCIENTIFIC BOOKS AND MEMOIRS, 344 



I. Description of a Monochromatic Lamp, with Remarks on the Absorp- 



tion of the Prismatic Rays by Coloured Aledia. By David Brew- 

 ster, LL.D. &c On the Absorption of Light by Coloured Media, 



and on the Colours exhibited by certain Flames, &c. &c. By J. F. 

 W. Herschel, Esq. Sec. R.S. Lond. and F.R.S. Edin. - ib. 



II. Some Account of the late M. Guinand, and of the important Discovery 



made by him in the Manufacture of Flint Glass for Large Telescopes, 348 



XXXIII. NOTICES OF RECENTLY PUBLISHED PERIODICAL 



BOTANICAL WORKS, - - 354 



Great Britain Monandrian Plants of the Order Scitamineae, by William 



Roscoe, Eeq. No. 2. Drummond's Musci Scotici. Botanical Magazine 

 for December, No. 458. Hooker's Exotic Flora, for December, No. 17- 

 Loddige's Botanical Cabinet, Part 92, December. Part 93, January 1825; 

 Greville's Scottish Cryptogamic Flora. Botanical Intelligence. 

 Progress of Botany in Russia. Intelligence from Austria. Intelligence 

 from North America. Denmark. Sweden. Mexico, - 354-359 



XXXIV. PROCEEDINGS OF SOCIETIES, - - - 300 



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



2. Proceedings of the Cambridge Philosophical Society, - 3b"l 



3. Proceedings of the Society for Promoting the Useful Arts in Scotland, 302 



