Vol. 5Ti Philosophical Magazine^ ApRitlSf 1, 



Contents of Number 276. 



^ XXXVII. Observations on Sutemenis made by Mr. Rt- 

 ■^1 CARDo, and others, " On the comparative Advantages of 

 illuininating by Gas produced from Oil and from CoaL" , 

 By Mr, George Lowe. ... Page 241 



I XXXVIII. On the Errors in Longitude as determined 

 by Chronometers at Sea, arising from the Action of the Iron 

 I in the Ships upon the Chronometers. By Ghosge Fisher, 

 I Esq. Communicated by John- Barrow, Esq. F. U.S. -2^ 



XXXIX. Sequel of the Experiments on lie Action of 

 the Voltaic Pile upon the Magnetic Needle. . By M. Bois- 

 GERAUD, Jun. - - - ., - . 257|J|i^ 



XL. Upon the different Qualities of the Alburnum of ^^^^ 



Spring- and Winter-felled Oak Trees. By Thomas Andrew J^^^ 



' Knight, Esq. F.R.S. - - - - , - 259 .^:| 



XLI. A Table of the Sun's Declination to every Ten ^?l- 

 nutes of his Longitude: with the Differences and Secular 

 Variation for Jan. 1 , 1 801 . (Obliq. of the Eclip. 25° 27' 61", 

 and Sec. Var. 52"'l.) Calculated from Taylor's Tables 

 of Logarithms. By Mr. James Utting, Lynn Regis. - 260; 



XLII. Discovery of Chromate of Iron in Shetland. By 

 Samuel HiBBERT, M.D. Edinburgh; - - - * 



XLIII. Observations relating to the Depression of Mer- 

 cury in Glass Tubes ; occasioned by an Article in the last ■ 

 Quarterly Journal of Science, By James Ivory, M.A. F.R.S. 267 



XLIV. True apparent Right Ascension of Dr. Maske- 

 lyne's 96 Stars for every Day in the Year I82L By the 

 Rev. J. Orooby. - _ - - - .-2691 



XLV. Description of an Improved Glaze for Porcelain. - ' 

 By Mr. John Rose, of Coalport, Shropshire. - - 272 



XLVI- ReportoftheCouncilofthe Astronomical Society ^f 



of London to the first Annual Generd Meeting Feb. 9, *' 



1821. , - - - - . . " - 273, 



XLVII. A Memoir on some new Modifications of Gal- 

 vanic Apparatus, with Observations in Support of his Theory 

 of Galvanism. By R. Hare, M.D. Professor of Chemistry 

 in the Universiiy of Pennsylvania. ... 284- 



XLVIIL' Description of the Marine Thermometer Case 

 invented by Mr. Robert JAMiEscfN, of Glasgow. - - 294 j 



XLIX. Description of a Mercurial Log-Glass, invented 

 by Mr. C. H.Jennings, of Carburton-street, Fitzroy-square.,300 1 



L. Notices respecting New Books. - - - - 301 ' 



LI. Proceedings of Learned Societies 303 



LI I. Intelligence and Miscellaneous Articles ; — New 

 Alkalies. — Steam-Engines at Consolidated Mines. —Indian 

 Com. — Pitf nts. — Mathematical Questions. — Barometrical 

 Observations. — Meteorological Tables. - - 308— 320 J 



aiCHARD AND ARTHUR TAYLOR, PRINTERS, SHOE LANB> LONDON. 



