Vol. ^8 



Phllosophloal Magazine. 



Oo. 1 



Contents oi 



i LII. Some Expeiiments matie with a view to the De- 

 ftcction and Pieveiition of Fr.iuJc in the Sale of skimmed 

 Milk ; together with an Account of a simple Lactometer 

 for effectirtj that Purpose. By Edmund Davy, Esq. Pro- 

 fessor of Chemibtry and Secretiuy to the Royal Cork Insti- 

 ;tution, - - - ' - P^ge 24^1 



LIII. Description of a new Method of forming Cruci- 

 bles, By Mr. Char^ks Cameron, Glasgow. - . 247 

 LIV. On Refraction. By J. Reade, M.D. - - .249 

 IjV. Process for preventing and correcting an Imperfec- 

 tion in Wines known by the Name of.Ropiness. By M. 

 Herpin. - ' - -. - - 254' 



LVI. On Napier's Rules of the Circular Parts. By 

 James Ivory, M.A. F.R.S. - - - ^55 



LVII. A Refutation of Mr, Hlrapath's Mathematical 

 Inquiry into the Causes, Laws, &c. of Heat, Gases, Gravita- 

 ^^ lion, kc. . . ... . . . 260 ' 



LVI II. True apparent Right Ascension of Dr. MaSkf- 

 lyne's 36 Stars for every Day in the Ytar 1821. By the 

 Rev, J. Grooby. - - - - - 262, 



LIX. Theorems for the Summation of progressional Se- 

 .ries. By Mr. James Benwell. - - • 261 



LX. Proposal for an Apparatus for Flying by means of 

 Motion only. By A Co-respondent. . - - 26S 



LXI. A Demonitration of Le Gendre's Theorem for 

 [ solving such spherical Triangles as have their Sides very 

 l^v^ small in proportion to the Radius of the Sphere. By James 

 '-S?^iIvoRY, M.A. F.R.S. ■ - , - - - 270 



LXI I. On the Change of Colour in Bl«e vegetable CO' 

 Icurs by metallic Salts. By Mr. J. Murray, - 273 



LXlll. On the Solar Eclipse of the 7th September 

 1 S20 J being a Comparison of Calculations with some of the 

 I Observations made in Great Britain and on the Continent. 

 By Mr, George Iknes. ... - 274 



LXIV. Account of a portable Apparatus for restoring the 

 Action of the Lungs. By Mr. John Murray. - 276 



LXV. An Account of the Comparison of various British 

 Standards of linear Measure. By Capt. Henry Kater, 

 F.R.S. &c. ..... "280 



LXVI. On Shot Cartridges. By Mr. Joseph Steevens. 288 

 LXVII. Remarks tending to facilitate the Analysis of 

 ^ Spring and Mineral Waters. By Mr. John DalVon, 291 



LXVill. Notices respecting New Books, - - 296 



LXIX. Proceedings of Learned Societies. - - 302 

 LXX. Intelligence and Miscellaneous Articles. 305—320 



RIOHARD AND AR.THUR TAYLOR, PKINTERS, SHOE LANK, LONDON. 



