CONTENTS 

 OF THE FIFTY-SEVENTH VOLUME. 



(jN the discordant Opinions delivered by the Chemists who gave 

 Evidence on the Trials of the Insurance Question o/' Severn, 

 KiNGj and Co. versus the Fire Offices. . . . . 3 



On the PyroUgneous Acid, its Manufacture and Uses. . . 10 



On the Magnitude of the Year. . . . . . . . . 15 



Account of the French Voyage of Discovery and Circumnaviga- 

 tion p^formed in 1818, 18\9, and \S20 ,. ..20 



A Table of the Sun's Right Ascension to every Ten Minutes of 

 his Longitude, with the Differences and Secular Variation for 

 January \, 180\ 28,182,260 



Answer of Mr, P. Nicholson to Mr. Holdred on Mr. N.'s 

 PVork on Involution and Evolution. . . . . . , 33 



On the Electro-Magnetic Experiments of MM. CErsted and 

 Ampere. .. .. .. .. .. ..40 



On tfte Calenmy Curve. . . . . . . . . . . 50 



On the Compressibility of IVater. .. ,. .. ..52 



On the lest Means for conducting meteorological Observations 

 in different Places and Climates, so as to produce some Uni- 

 formity in the Modes of obtaining and summing up the Re- 

 sults. . . . . . . . . . . . . . . 81 



Additional Observations on the Use of Lactucarium, or Lettuce 

 Opium; particularly in a Case of Cyna7iche Laryngea, or 

 Croup. . . .. . . . . . . . . . . 84 



On the Norlii-iue'-.t Magnetic Pole. . . . . . . 88 



On the Application of the explosive Poxver of Coal Gas as a First 

 Mover in Machinery. , . . . . . . . . . 93 



On Chemical Equivalents. . . . . . . . . 95 



Dr. Granville's Reply to a Review in Professor Brande's 

 Journal of Science. .. .. .. .. ..116 



Vol. 57. No. 27 S. June 1821. a Geo- 



