,VoL. 4&. PMIosophical Magazine. February 1817. j 



Pagi. 



CONTENTS'OF NuMBER 226. 



By Mi-. M. Al 



XIX. Essays on Chemical Philosophy 

 LEN, Lecturer. - - * - --81: 



2iX. On Barometric Pressure; Whether affected by being 

 ^posited beneath :i Balloon in \:he Act of ascending or de* 

 scendir.g? By A Corrf.spokdent. 



XXI. Medical Premium of Fifty Guineas ofrered by A 



I'v^'ORRESPONpENT. - -' - ' - - 88 



XXII. Observations on the Advantages arising from the 

 Use of the Wire-gauze Safety-lamp, commonly called The 

 Davy. By Mr. .ToHN BuDDLK. - - - 90] 



XXIIJ, On tlie pretended Prioi-ity of Mr, Stevenson's 

 I Safe-lamp. By P. W. Kxight, Esq. ~ - - 94 



XXIV. On theLaws of 'J"'erTestrial Magnetr^ni in difFerenl 

 Latitudes. By M. Siot ; v/itli Notes by T.S.Evans, 

 LX-D. of Christ's HospitaL - - - - 95 , 



[XV. Answer to Mr. John pAREy. Sen. and tc Dr. John I 



^Murray. . - , - - - - - -■. KH^ 



XXVI. On the Union of Copper with Iron, &c. By Mr. . 

 P.N.Johnson. - , . . - - 107' 



XXVII. On the Restoration of Vision, when injured or 

 destroyed in consequence of the Cornea having assumed a 

 conical Form. By Sir William Adams. - - llO' 



XXVIII. On ti-.e Phenomena of Platinum and other 

 'Wires in inflammable Media. - - - ,- 320! 



XXIX. Geological Queries, regarding the Coal Strata, 

 Basaltes, and Red Marl, of Northumberland and Diwham, 

 and on the Appearances of Coal, &c. in Lincolnshire. 



XXX. On the Physiolvigy of Vegetables. By Mrs. 

 '^')f Agnes 'Ibbf.tson. - - ^ - 



XXXL On Astro-atmo-pherical Science. By the Rev. 

 ;T. Drummosd. - - - ■ - 



XXXII. Brief Notice of a Discovery by v/hicK Sir H. 

 ^k Davy's Safe-lamp may be made to i-e-li^ht itself when ex- 



Uinguished in the Mine. By J. Murray, Esq. 



XXXIII. Reply to Mr. Horn. By Mr. W. Patsr. - 



XXXIV. On iSlr. lioRN's Theory of Vision. 



XXXV. On thr Sulphuret of Carbon and on .•■laine, &c. 

 By J. Murray, Esq. - "- - 



' XXXVI.' Observations' on the Combination of Metals 

 y^Mv,'ith Sulphur. By M.A.J. Frere DF. Montizok. - 

 XXXVII,, Notices respecting New Books -, 

 XXXV III. Proceedings of Learned Societies. t—rRcyal 

 Society— Royal Society of Edinburgh — Society of Ltghorn. 

 i —French Royal Academy of Sciences . . - 



I XXXIX. Intelligence and Miscellaneous Anicles : 

 Figure of the Earth— Pendulum^ — Indentation in the Sun's'. 

 Edgc-^Steam JSngines in Cornwall — Agriculture — Safetj- 

 laVnps— Comparative Temperature of Rain in IS 15 and 

 ^^18It> — Expedition to Africa— Clarifying of Sugar — Swal- 

 ?!f^j|lows — Aurora Borealis-^ Speaking Trumpet— -Pa tents— 

 ^'iiif Astronomical Phxnomena — Meteorology - -149—160 



RICHARD AND AUTHUHTAYLOBi P&IHTBRS, 8H&£ tANS|I«QJl''Q^' 



