VOL. LXV.] 



PHILOSOPHICAL TKANSACTIONS. 



687 



with a more temperate heat, but require longer continuance of it, may arrive at 

 maturity in both countries. The reason why the mean heat of London exceeds 

 that of Edinburgh, may arise principally from the difference of latitude. But 

 the reason why the excess is greater in proportion in the 3 hottest months of the 

 year, at the hottest time of the day, than in the winter months, arises from 

 Edinburgh's being situated nearer to the sea than London. We might speak, 

 with more precision on this subject, if we had a register of the thermometer at 

 Moscow, which is nearly in the same latitude as Edinburgh ; though it is well 

 known that the heat of summer is much more intense, and the cold of winter 

 much more severe, at Moscow, than at Edinburgh. The mean heat of springs 

 near Edinburgh seems to be 47°; and at London 51°. It is probable, that the 

 mean heat of good springs in any country is very nearly the mean heat of the 

 country. A faithful account of the heat of springs in different latitudes, and of 

 water taken from the same depth of the sea in different latitudes is yet wanted. 



XLV. Experiments in a Heated Room. By Matthew Dobson, M. D. p. 463. 



Exper. The sweating-room of our public hospital at Liverpool, says Dr. D., 

 which is nearly a cube of Q feet, lighted from the top, was heated till the 

 quicksilver stood at 224° on Fahrenheit's scale ; above which the tube of the 

 thermometer would not admit the heat to be raised. The thermometer was 

 suspended by a string fixed to the wooden frame of the sky-light, and hung 

 down about the centre of the room. Myself and several others were at this 

 time inclosed in the stove, without experiencing any oppressive or painful sensation 

 of heat, proportioned to the degree pointed out by the thermometer. Every 

 metallic about us soon become very hot. 2. My friend Mr. Park, a surgeon, 

 went into the stove heated to 202". After 10 minutes, I found the pulse 

 quickened to 120°. And to determine the increase of the animal heat, another 



