VI 11 CONTENTS. 



NUMBER XCIX.— SUPPLEMENT. 



Page 

 Mr. Ivory (The Bakerian Lecture) on the Theory of the Astro- 

 nomical Refractions 497 



Col. R. Wright's Meteorological Observations during a Resi- 

 dence in Colombia between the Years 1820 and 1830 508 



Proceedings of the Royal Society, Geological Society, Zoolo- 

 gical Society, Microscopical Society, and Italian Scientific 



Association 517 — 551 



Chlorosulphuret of Mercury 551 



Formation of Sulphuric Acid. By M. H. Rose 553 



Sulphuretted Hydrogen — Action on some Salts of Potash. By 



H. Rose 553 



Whiteness of Precipitated Sulphur. By H. Rose 554 



Uric Acid 555 



Chloriodide of Potassium. By M. Filhol 555 



Fall of a Meteorite in Missouri, February 13, 1839 557 



On the supposed existence of Fluoric Acid in Animal Matter. 



By G. O. Rees, M.D 558 



Index ,, 561 



PLATES. 



I. Prof. Draper's Improved Torsion Balance, p. 266. Scales of But- 

 terflies' Wings observed by the Rev. E. Craig, p. 279. 



II. Illustrative of Mr. W. S. Harris's Paper on Lightning Conductors, 

 p. 461. 



III. The order of Superposition of Rocks in the South of Ireland, illus- 

 trative of Mr. C. W. Hamilton's Paper on the Older Stratified Rocks 

 in the Neighbourhood of Killarney and Dublin, p. 442. 



ERRATA. 



Page 61, line 6, for turnpeg read tamping, 

 line 26, for rivets read roots. 



311,line2. ^^=-f .^(3.) 



14, for cone. log. read com. log. 

 16, 17, for A' read A. 

 at bottom, place X after 2077 '98. 

 445, line 8 from the bottoin,/or PI. I. read PI. III. 



V. XIV. 

 514, line 12, for tud read tufa. 



