IV CONTENTS. 



Page 



On the Liquefaction of Chlorine and other Gases. By Mr. Faraday 89 



New Locality of the Skorodite. By W. Phillips, FLS 97 



On Fluorine. By J. Smithson, FRS 100 



On the Composition of the Ancient Ruby Glass. By Mr. Cooper 105 



On the ensuing Opposition of Mars. By F. Baily, Esq. FRS. VPAS. . . 107 



Table of the Salt Springs in Germany. By C. Keferstein 109 



An Examination of some Egyptian Colours. By J. Smithson, FRS.... 115 

 On the Crystalline Forms of Artificial Salts. By H. J. Brooke, Esq. FRS. 



(continued) 117 



On the Occurrence of Cleavelandite in the older Rocks. By W. Phillips, 



FLS. MGS 118 



Astronomical Observations. By Col. Beaufoy, FRS 121 



Improved Clinometer. By M. P. Moyle, Esq 122 



Reply to the Editor. By Mr. Gray 1 23 



Remarks upon the preceding Answer. By R. Phillips, FRS. &c 128 



On the Detection of small Quantities of Arsenic. By Dr. Traill 131 



Expansion of Gases. By Mr. Biggs 133 



Account of a New Mineral. By M. Levy, MA 134 



Corrections in Right Ascension of 37 Principal Stars. By James South, 



FRS. (concluded) 136 



Analytical Account of the Philosophical Transactions, for 1823, Part II. 



(continued) '43 



Proceedings of the Royal Society , 147 



. . Linnean Society - 150 



. . Astronomical Society -. 152 



. Geological Society 153 



, — • Meteorological Society of London 154 



Dark and bright Lines traversing the Spectrum 154 



Analysis of Cleavelandite 1 55 



Copper Pyrites of Orijarva 1 55 



Scapolite from Pargas 155 



Manufacture of Pianoforte Wire 156 



New Scientific Books 156 



New Patents ,6 7 



Mr. Howard's Meteorological Journal 158 



NUMBER III.— MARCH. 

 On the Crystalline Forms of Artificial Salts. By H. J. Brooke, Esq. 



FRS. (continued) l6t 



On the Daily Variation of the Horizontal and Dipping Needles under a 



reduced directive Power. By Peter Barlow, Esq. FRS 163 



On an Improved Apparatus for the Analysis of Organic Products. By 



Mr.Cooper. (With a Plate) 170 



On the Ancient Tin Trade 175 



On Fossil Shells. By L. W. Dillwyn, Esq. FRS 177 



