CONTENTS. 1U 



Page 



6. Method of making Impressions on Steel Plates, - - 346 



7. Description of Improved Axletrees. By Mr William Mason, ib. 



8. Account of the Vitruvian Cement for building and other purposes. 



An invention communicated to Mr J. P. Beavan by a Foreigner, ib. 



9. Mr Samuel Morey's New Vapour Engine, - • 347 



10. Account of the performance of one of Mr Perkins's Steam-Engines, ib. 



1 1. On the method of preparing Catechu in Bundelkund in India, 349 



12. On a new method of manufacturing Glass. By M. Legnay. ib» 



13. Description of an improved Mortise Lock. Invented by Messrs 

 John and Thomas Smith, Darnick, 



350 



XXVIII. ANALYSIS OF SCIENTIFIC BOOKS AND MEMOIRS, ib 



Deutschland's Flora. By Feanc. Carl. Mertens, and W. H. J 

 Koch, - 



ib- 



XXIX. SCIENTIFIC INTELLIGENCE, - 364 



I. NATURAL PHILOSOPHY. 



Astronomy 1. Correct Elements of the first Comet of 1825. 2. Correct 



Elements of the Second Comet of 1825. 3. Elements of the Comet discovered 

 by M. Pons. 4. Fourth Comet of 1825. 5. Dimensions of the Terrestrial 

 Globe. 6. La Lande's Astronomical Prize adjudged to Captain Sabine. 7- 

 Kates of Mr French's Chronometers at the Royal Observatory. 8. Probabi- 

 lity of an Ethereal Medium in the Celestial Spaces. 9. Change upon the fi- 

 gure of Saturn when emerging from the Moon's dark limb, 364 — 36G 



Acoustics— 10. Deafness arising from the Eustachian Tube. 11. Great dis- 

 tance at which Sounds are heard, - - »b. 



Optics 12. Phosphorescence of the Glow-Worm, of the Fire- Fly, and the 



Lampyris Noctiluca. 13. Remarkable Phosphorescent Stone, 366—367 



Hydrodynamics 14. Prize of 1828, for the most important experiments 



on the Resistance of Fluids. 15. Dr Hare's Litrameter for measuring Specific 

 Gravities, - 367-368 



Magnetism 16. Magnetic Declination at Bywell, in Northumberland, in 



1824. 17- Magnetic Declination near St Petersburg, in 1824, 368 — 369 



Electro-magnetism — 18. On the Magnetising of Needles by Currents and 

 Electric Sparks, - - - - 369 



Meteorology 19. Meteorological Observations made on the 17th of July 



last. 20. Mr Foggo's Elementary Treatise on Meteorology. 21. Mean Tem- 

 perature of the Sandwich Islands. 22. Meteoric Stone ftom Castres, 369—371 



11. chemistry. 



23. On the Chemical Composition of Felspar and Serpentine — 24. Analysis 

 of a new Mineral, (the Gay-Lussite.) By M. Boussingault — 25. On Fecula 

 and the different Amylaceous Substances of Commerce. By M. Caventou — 

 26. Muride, a New Substance, intermediate between Chlorine and Iodine, 371—375 



in. natural history. 



Mineralogy 27. Crystals of Sulphur in Gahena.— 28. Native Alum found 



at CaliDgasto, in South America. - - 375 



