Vol. 57' PliHosbphical Magazine. 



Contents of Number' 274. 



XII. On the best Means for conducting meteorological 

 Observations in different Places and Climates, so as to pro- 

 duce some Uniformity in the Modes of obtaining and sum- 

 ming up the Results. By Luke Howard, Esq. 



XIII. Additional Obserralions on the tJse of Lactuca- 

 rium, or Lettuce Opium ; particularly in a Case of Cynanche 

 Laryngea, or Croup. By Andrew Duncan, Sen. M.D. 

 and P.E. &c. - - - 



XIV. On the North-west Magnetic Pole. By Colonel 

 Macdonald. -.--.» .. 



88 



XV. On the Application of the explosive Power of Coal 

 Gas as a First Mover in Machinery. By George Lowe, £sq. 93 



XVI. On Chemical Equivalents. By Andrew Ure, M.D. 

 Professor of the Andersonian Institution, Glasgow. - 95 



XVII. Dr. Granville's Reply to a Review in Profes- 

 sor Brande's Journal of Science. - . » . . 116, 



XVIII. Geocentric Places of Vesta and Ceres ; and the 

 apparent Right Ascension of Dr. Maskelyne's 36 Stars 

 for March and April 1821. - - . - -129 



XIX. On the Visibility of the Planet Venus during the 

 Day, and the Use that may be made of this Fact in dcter- 



Sl" lira mining Longitude 



!lf^ XX. Notices respecting New. Books. 



XXI. Proceedings of Learned Societies. 



. 13'1- 

 135 



138 1 



XXII. Intelligence and Miscellaneous Anicles — De- 

 ' structton of Zante by an Earthquake. — Statistics. — Com- 

 pressibility of Water. — ^^The Unicorn discovered. — Astro- 

 nomical Instruments. — Essential Oil of Tar Lights. — Earth- 

 tjuake. — German Sausages. — Agriculture. — Iodine in 

 Sponge. — List of Patents for New Inventions. — On the So- 

 ! lar Spots. — Mercurial Atmosphere. — New Comet. — Astro- 

 nomy. — ^Reply to Mr. Innes — Meteorology, &c.&c. lil — 



160' 



%* Communications for this Work, received by the Editoi-, [^ 

 Pickett-Place, Temple Bar, will meet with every attention. V^ 



aiCHARD AND ARTHUR TAVLOK, PRINTERS, SHOE LANBj LONDON . 



