Vol. 54. - Philosophical Magazine. Sept. 181 



161 



- 164- ' 



172 y 



raj Contents of Number 257. 



sRI _ ^ Page 



XXIX. On Mr, TrSughton's Expedient for correcting 

 Errors arisinsf from theExcentricit3' of the Point round which 

 the Indexes revolve in Refiscting Circles. By Mr. Edward 

 Riddle, Newcastk-on-Tyne. . . - - 



XXX. Experiments on the Gss from Coal, chiefly with 

 a view to its practical Application. By William Henry, 

 M.D. F.R.S: &c. ' . - - 



XXXI. First Report of the Commissioners appointed to 

 * consider the Subjects of Weights and Measures. - 



XXXII. Observations on the Relation of the Law of De- 

 ! finite Proportions in Chemical Combination, to the Consti- 

 tution of the Acids, Alkalis, and Earths. By John Mur- 

 ray, M.B. Fellow of tiie Roy^l College of Physicians, of 

 the Rdyal Society of Edinburgh, the Geological Society of 

 London, &c. ; Lecturer on Chemistry, and Materia Medica 

 und Pharmacy. ' - . ., " . 



XXXill, Remarks on Madeira, Climate of the Tropics, 

 Trade-Winds, Rio Janeiro, the Polar Ice, &c.- Extracted , 

 from a Journal kcpfby John PIammet, M.D. in a Voyage 

 from England to Rio Janeiro. Gommunlcated by Dr. Pear- 



ISON. . - - - - - 



XXXIV. Observations on certain free Remarks by Mr. 

 Farey published in the last Number of tlie Pliilosophical 

 Magazine. By Q. B. Greekough, Esq. 

 ■ XXXV. A new Theory of Galvanism, supported by 

 l^jsome Ejcperimcnts and Observations made by means of the 

 Ithl Calorimotor, a new Galvanic Instnmient ; also, a new Mode 

 of decomposing Potasli extemporaneously. Read before 

 the Academy of Natural Sciences, Philadelphia. By R®bert 

 HarE; M.D. Professor of Chemistry in the Medical Depart- 

 ^.ment of 'the University of Pennsylvania, and Member of 

 '^^3 several Learned Societies. - - . - 



XXXVI. On Friction in Machinery. By Mr. Henry 

 J^^ Meiklt;. - - - - - '- 



ik%p^ XXXVIJ. On poisonous Tea-Leaves. By Mr. James 

 %^ Millar. - ' --. - . 



^iiC ^5 XXXVllI. On the Geology of Loch Leven in Scotland. 

 ^'i| By Mr. Gavin Inglis. - "\ " 



^ 



182 



ISV 



218 i 



XXXIX. Notices respecting New Books. - 

 XL. Intelligence and Miscellaneous Articles. 



220 1 

 - 2'^i 

 229—210 



*i,* Communications for this Work, addressed to the Editor, 

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



RICHARD ANB ARTHCTR TAYLOU, PRINTERS, SHOE LANB^ LONDON. 



