358 Ncxo Galvanic Experiuicnts and Pluenomena. 



over the bed of the Severn and settled on its sm'face. Three dif- 

 ferent barometers were examined on the occasion. One, thirty 

 feet above the Severn, stood at 29*5 inches, surface somewhat 

 concave ; another, nine feet above tlie level of the river, indi- 

 cated the altitude of the mercury to be 29*4 inches; and on the 

 same plane a wheel barometer was stationary at " changeable." 



Plaving taken a boat I was enabled to ascerta,in the tempera- 

 ture of the river for some miles, both toward the centre and 

 toward the margin. From four to six o'clock p.im. the "water 

 was uniform in all its extent, at least the range was within the 

 limits 52° to 52'5 Fahrenheit, — the ball of the thermometer 

 which projected two inches from the scale afforded me the 

 measure of immersion. The atmosphere resting on the river 

 at an inch from its surface sustained a temperature which 

 fluctuated between the points 57*5 and 58*25 Fahr. 



The atmosphere over the banks of the Severn was ex- 

 amined on both sides of the river, and its range included 61° 

 to 62° of the scale of Fahr. 



The fog or mist which had been entirely limited to the bed 

 of the river, became general at night, and the nocturnal sky 

 was without a cloud. 



I tender you the facts, and have no theory to support. The 

 evolution and subsidence of the aqueous vapour, may in this 

 instance, at least, be perhaps explained by supposing that a 

 portion of the cooler air from over the river moves to that of 

 superior temperature resting on the river bank, and the former 

 being thus attenuated in density, the deposition of aqueous va- 

 pour ensues as a necessary consequence. 



I have the honour to be, 

 Gentlemen, 



Your most obedient servant, 

 Bcwdley, October o, 1822. J. MuRRAY. 



LXXIII. Notice of some New Galvanic Experiments and 

 Phcenomcna. By John Murray, F.L.S. M.W.S. Sfc. Sfc. 



To the Editors of the Philosophical Magazine and Journal. 



Gentlemkn, — Our views on the nature of the agencies de- 

 veloped through the medium of the galvanic instrument, and 

 their relations' to the pha-nomcna of heat and magnetism, are 

 exceedingly perplexed and obscure. We have many valuable 

 facts in our possession, but their source and connexion are 

 utterly unknown. We shall surely do well to swell the great 

 volume of Tacts, and wait with patience the rcvchition to 



which 



