V ox.' ^y. I'iulosophical Magazine. Jani/ary ISlTi 



Contents of Number 225. 



, ,,^ 1. On the Laws of .T'errestrial Magnetism in diflfereni 

 '7'*) Latitudes ' - 



IL lletn;xiks and Suggestions for improving the British 

 ij |,|^ Cc.in, and the keeping of Monay Accounts, preparatory to 

 \'?',f^i' the entire Introduction of Decimal Monev. By Mr. John 

 Farey, Sen. - - - 



III. On the Article in our last Number, entitled " Con- 

 trovcrsy ccnicerning Safe-lamps." By W. P.Knight, 'Ef.q. 



IV. On Vision : in Answer to Mr. Pater. By Mr. A;;- 

 DR.EW Horn. - - 



V> On Mr, Gi;orge Stevenson's Pretensions to the Dis- 

 5>'«j.^ CO i-ery of the Safe-lamp. By A Correspondent. - - 

 &iJ]ir . VL Remarks on Mr. Laplace's Table of the Depres- 

 lijT^ sion of Mercury in the Tubes of Barometer. " - * - 



f^^- VII. Some Account of the White Mountair.s of New 

 ^^ Hampshire.* By Jacob Bigelow, M. D. I.,ecturer-cnMa- 

 s;^ teria Medica and Botany, and Rumford Professor in Har- 

 cllj!!'' vard University. - - .... . 



V^ VI II. Ejiperiments on vafiou<i refractory Substances by 

 /M ^ means of the Oxi-hydrogen Blow-pipe. By J.MuRHAY.Esq. 

 v^w ^^' ^" ^^^ nncient Names for Colour, particularly as ap- 

 ^.^ plied to the Colour of the Light of Stars! By T. Forster, 



j^-fetV X. Combination of the Electric Column, the Theimo- 

 >.i,i j^ meter. Barometer, and Hygrometer in one Instrument, for 

 wM^ Elec'.ro-atmospherical Researches! By A Corresponoknt 

 ^'^j^S XI. Mr. Fauev's Correction of his Remarks in our last 

 i'^^ Number, regarding a Geologi.st being attached to the Go- 

 ^Jl'iwvernment Trigonometrical Establishment ■ - 



XII. On tiie indispensable Necessity of perfectly venti- 

 lating Coal-pits,and the Insufficiency and Danger of Safety- 

 'impj, as Substitutes for such '/entilation. By Mr. John 



p»g4 



49 



ib. 



hting Coal-mines, proposfed 



P^^ Farey, Sen. Mineral Surveyor 



WWi Xill. On the Lamp for lighti 



S^byJ.MuRiCAY. M.D:F.R.S.E. 



(<iij3 M XIV. On the Safe-lamp, and the Ventilation of Mines. 

 P-MBy Mr.J. MuRR.-. 

 ^'^^. XV. On the Or 



- 61 



rder of the Uppei- Strata of the Soath-east 



631 



^*>fA Part of England. Deduced from a Series of Observations 

 ^||J^niatlefor Sir Henry Englefield, In the Years ISJ 1,1812, 

 jf*^ 181.% by-TiioMAs Webster, Esq. M.G.'S. 



XVI.' Notices respecting New iJooks - - _ 



XVII. Proceedings of Learned Societies. : — Royal 80- 

 |Ci(;ty — Calcutta Asiatic Society - ' - ' $9 



XVIII. Intelligence and Miscellaneous Articles:—- 

 Potassiwm — Steam Enginess in Cornwall — Chirk Collieries 



-Expedition to Africa — Patents' — Lecture — ./^strono- 

 njtcal Ph'<enomena— Meteorology - . , 72 — SO 



v^i *»* Communication.s for this Work, addressed to the Editor, ; 

 1^i;/l^ickett- Place, Temple Bar, will meet with every attention. 



&rCHAP.D AND^KTHUftTAYWK) r&INTSftSj ^OS LAK£^i.0]KDOK< 



