CONTENTS. 



Geocentric Places of Vesta and Ceres; a?id the apparejit Uight 

 Ascension of Dr. Maskelyne's 3() Stars for March and 

 April 1821 129 



On the Visihility of the Planet Venus during the Day, and the 

 Use that may he made of this Fact in determining Longi- 

 tude 134 



New analytic Formula and Talle nfan increasing Life Annuity ; 

 with Remarks on the Surrender of Life Assurance Policies at 

 Proprietary Offices. .. .. .. .. ..161 



Oti the Solar and Lunar Periods. . . . . . . 168 



On the Division of the Circle into seventeen equal Parts. 172 



Some Account of a Method which may be applied to the same 

 Purposes as Sir Isaac Newton's Method of Fhixions. 177, 



200, 325 



Lunar Talks: leitig an Appendix to pages 244, 344, 43'9, of 

 . Vol. n.—p. 17, 81, 278, 354, of Phil. Magazine 1820. 179 



On Sounds inaudible hy certain Ears. .. .-. .. 187 



On the Constitution of aqueous Ammonia. . . . . 192 



Right Ascension, Declination, and Passage of the Meridiari of 

 Ceres ; and true apparent Right Ascension of Dr. Maske- 

 lyne's 36 Stars for every Day in the Year 1821. 197, 269, 



353, 406 

 On the Action of the Voltaic Pile upon the Magnetic Needle. 



203 

 Observations on Statements made by Mr. Ricardo, a7id others, 

 •*' On the comparative Advantages ofilhiminating by Gas pro- 

 duced from Oil and from Coal." .. .. ..241 



On the Errors in Longitude as determined by Chronometers at 

 Sea, arising from the Action of the Lo7i in the Ships upon the 

 Chronometers, . . . . . , . . , . . . 249 



Sequel of the Experiments on the Action of the Voltaic Pile upon 

 the Magnetic Needle. .. .. .. .. 257 



Upon the diferent Qualities of the Alburnum of Spring- and 

 mnter-felled Oak Trees 259 



Discovery of Chromate of Iron in Shetla?id. . . . . 265 



Observations relating to the Depression of Mercury in Glass 

 Tubes ; occasioned by an Article in the last Quarterly Journal 

 of Science. . . . . . . . . . . . . 267 



Description of an improved Glaze for Porcelain. . . 272 



. 



