IV CONTEXTS. 



Page 

 Art. XXXV. SCIENTIFIC INTELLIGENCE, - - 364 



I. XATDSAL PHILOSOPHY. 



Astronomy 1. Remarkable Double Tail in the Comet of 1823. 2. Sup- 

 posed influence of Comets on the Sun's Surface. 3. Periodical Comet of 

 1819. 4. Depression of the Horizon at Sea, - - - 364,36* 



Optics.— 5. Refractive Power of Dry and Humid Air. 6. Polarisation of 

 Light from Solid or Fluid incandescent Bodies. 7- Optical Phenomena ob- 

 served by M. Ruppell. 8. Remarkable Dichroism of Axinite. 9. Optical 

 Structure of Somervillite, - - ... 3C5, 36C 



Magnetism. — 10. Magnetic Variation at Lake Superior. 11. Magnetic De- 

 clination at Paris in 1822 and 1823, - - - 366, 367 



Meteorology. — 12. Great Inundation in Sweden and at St Petersburgh. 

 13. Great Rain at Manchester in 1824. 14. Diurnal Variation of the Ba- 

 rometer at Marseilles, ..... 367-369 



II. chemistry. 

 15. Deoxidating property of the Vapour of Water. 16. Quantity of Heat 

 disengaged during Combustion. 17. On the Colouring Matter, called Chica, 

 by the Indians. 18. Avogadro's Table of the Affinities of Bodies for Ca- 

 loric 19. Avogadro's Table of the Neutralizing Powers of different Sub- 

 stances. 20. Analysis of the Sulphuret of Manganese from Transylvania, by 

 Arfvedson. 21. Analysis of Blende, Crystallized, Yellow, and Transparent, 

 by Arfvedson. 22. Analysis of Capillary Pyrites, by Arfvedson. 23. Ana- 

 lysis of two varieties of Harmotome, by Dr Wernekingk of Giessen. 24. 

 Analysis of Sideroschisolite, by Dr Wernekingk. 25. Analysis of Uranite 

 by Berzelius, ..... 369-3/2 



III. NATURAL HISTORY. 



Minehalogy. — 26. Axotomous Arsenical-Pyrites, a New Mineral Species. 

 27- Prismatoidal Copper-Glance, a New Mineral Species. 28. Axotomous 

 Antimony-Glance, a New Mineral Species. 29. Hemiprismatic Ruby- 

 Blende, a New Mineral Species. 30. Fergusonite, a New Mineral Species. 

 31. Picrosmine, a New Mineral Species. 32. Brookite, a New Mineral 

 Species, - - - - - 373-377 



Botany 33. On the Nature of Galls, - - - 378 



Zoology — 34. Physalia Arethusa, ... . ib. 



IV. GENERAL SCIENCE. 



35. Hatching of Fish. 36. Mr Lizars' Work on the Removal of Ovaria. 37. 

 Mr Bate's Essay on Spectacles. 38. Mr Innes's Tide Tables for 1825. 39. 

 The Emperor of Russia's Present to Professor Barlow, - 378, 379 



XXXVI. List of Patents for New Inventions, Sealed in England since 

 July 27, 1824, ... 379 



XXXVII. List of Patents granted in Scotland since November 30, 1824, 381 



XXX VIII. Celestial Phenomena, from April 1, to July 1, 1825, calculated 

 for the Meridian of Edinburgh. By Mr George Innes, Aber- 

 deen, - ..... ib. 



XXXIX. Register of the Barometer, Thermometer, and Rain- Gage, kept 



at Canaan Cottage. By Ai.r.x. Adie, Esq. F. R. S. E. - 384 



