INDEX. 



Smithson, James, Esq,. On a saline substance from Mount 

 Vesuvius, - - - - 256 



Solstice, summer^ observation of that of 1812, at the Royal 

 Observatory, - - - - 27 



~ observation of that of I8I3, at the Royal 



Observatory, - . - _ 298 



— winter, observation of that of 1812, with the mural 



circle at Greenwich, - - - 123 



Spheres, perfect, supposed to be the elementary particles of 

 fluor spar and such other substances as assume the octo- 

 hedral and tetrahedral forms, • - - 54 



Squalus Maximus, additions to an account of its anatomy con- 

 tained in a former paper, - - - - 527 

 Stars, principal fixed, catalogue of north polar distances of 

 some of them. ... - - 75 



, catalogue of north polar distances of 



eighty- four of them, - - - 28 1 



Struthio Camelus, description of its solvent glands and gizzard, 80 

 Sulphuret of carbon, or Alcohol of sulphur, experiments on it, 17I 



— — — — experiments to determine the proportions 



of sulphur and carbon contained in it, - - 182 



comparison of the proportions of sulphur, 



and carbon in it, with those which might be inferred from 

 the laws of determinate proportions, - - I89 



experiments on its combination with the 



the alkalies, the earths, and the metallic oxyds, • 192 



experiments to determine the nature of ai 



particular substance produced by the action of nitro-mu- 

 riatic acid upon it, - - - I95 



experiments on the production of cold 



by the evaporation of it, -. - - 252 



T 



Tetrahedron and octohedron, relation of these solids to each 

 other in crystallography, - - - 51 



Trimmer, Mr. William Kirby. His account of some 

 organic remains found near Brentford, Middlesex, - 131 



Tycho L. Tychonius. His account of a narwhale's skull, 

 published in I706, referred to, - - 12? 



U 



Ulmin, on a substance from the elm tree, so called, ; 64 



