CONTENTS 

 OF THE FORTY-NINTH VOLUME. 



UN the Laws of Terrestrial Magnetism in different Latitudes. 



3,95 



Remarks and Suggestions, for improving the British Coin, and 

 the keeping of Money Accounts, preparatory to the entire In- 

 troduction of Decimal Money . .. .. .. l(j 



On the Article in our last Number, entitled^' Controversy con- 

 cerning Safe-lamps." . . .. . . . . 23 



On Vision: in Answer to Mr. Pater. .. .. 26 



On Mr. George Stevenson's Pretensions to the Discovery of 

 the Safe- lamp. .. .. .. ., ., 29 



Remarks on Mr. Laplace's Table of the Depression of Mer- 

 cury in the Tubes of Barometers 31 



Some Account of the IVhite Mountains of New Hampshire. 32 



Experiments on various refractory Substances by means of the 

 Oxi-hydrogen Blow-pipe. . . . . . , . . 47 



On the ancient Names for Colour, particularly as applied to the 

 Colour of the Light 0/ Stars. .. .. .. 49 



Combination of the Electric Column, the Thermometer, Baro- 

 meter, and Hygrometer in one Instrument, for Electro-atmo- 

 spherical Researches. . . . . . . . . 55 



Mr. Farey's Correction of his Remarks in our last Number, 

 regarding a Geologist being attached to the Gover?iment Tri- 

 gonornetrical Establishment. . . . . . , 55 



On the indispensable Necessity of perfectly ventilating Coal-pits, 

 and the Insufficiency and Danger of Safety-lamps, as Sub- 

 stitutes for such Ventilation. .. . . . . 57 



On the Lamp for lighting Coal-mines, proposed by Dr. J. Mur- 

 ray. 61 



On the Safe-lamp, and the Ventilation of Mines. . . 63 



On the Order of the Upper Strata of the South-east Pari <f 

 England. . . , . . . , . . , _ ^ g5 



Essays on Chemical Philiisophy. 81 



On Barometric Pressure ; IVhether affected by being posited 

 beneath a Balloon in thcylct of ascending or desr uling? 85 



Medical Premium of Fifty Guineas offered by A Correspon- 

 dent. . . . . • . , , 33 



Vol.49. No. 230. jMrae 1817. a 



