Hot and Tlwrmul Springs. 343 



disintegrated gneiss, forming the floor of a cellar under a 

 smithy, showed, in 1830, a mean temperature of 49°.79, which 

 was much too high, compared with other observations made at 

 ihe surface. This was caused by the strong fire in the smithy, the 

 greatei^t proximity of which to the thermometer was l'^- feet* 



I have i-educed the centessimal degrees of tlie observations, 

 made near the surface, at various places in the Saxon Erze- 

 birge, into degrees of Reamur, and arranged them in the fol- 

 lowing tabK^ The numbers represent the monthly mean tem- 

 perature. Reich also gives the maximum and minimum of each 

 month ; but these I have omitted for shortness' sake, and have 

 confined myself to noting, in the four last lines, the greatest 

 yearly differences of temperature, which is of the most import- 

 ance for our object. The places of observation are arranged in 

 the order of their depth below the surface ; but their elevation 

 above the sea is at the same time marked. 



" Pcrliaps also llic water ii;:c(l lor (jucuching ami liardcning m;iy liarc 

 found its way to the spot where the tliermometer was placed. 



