446 



Data toixards determining the Dea-ease 



should represent very nearly the mean of the twenty-four. 

 Let us, for the convenience of whole numbers, make the 

 preceding general average of 239 ft. into 240 ft., and take 

 it as the standard for the diminution of temperature during 

 the whole year, as well as in the summer. The mean annual 

 temperature, near the sea-level, in lat. 57°, is about 47° ; and 

 that of summer, 58°. From these data, the temperature of 

 the Grampians should be thus : — 



The mean annual temperature at Lead Hills (corrected by 

 the Leith Fort observations) is 44^°; that of summer, 55\^, 

 The height is 1280 ft., as above mentioned. 



2. Temperature of the Earth, — The mean temperature of 

 the earth, at Lead Hills, is stated to be 44°. In other neigh- 

 bouring places, of moderate elevation, it is given thus : — 



In the Edinburgh Philosophical Journal, the temperature of 

 springs on Ben Nevis is given as here copied : — 



I observed the temperature of a bubbling spring, throwing 

 out a stream of water, on the moors near Locheil, and of the 

 well near the summit of Ben Nevis, on the west side, in Au- 

 gust, 1832. The temperature was then : — 



On the 9th of May, 1832, the temperature of seven small 

 springs, or drains, from the sides of Carnedd David, in Caer- 

 narvonshire, varied only between 39° and 39J°, though the 



