Mr Hen wood on the temperature of Mines. 



237 



table contains a selection of such observations as have been 

 made on the temperature of water immediately, or at a very 

 short interval after it had gushed from the rock. 



i 



are the gushing streams 

 at great depths generally warmer than the water or the air in 

 the shallower parts of mines, but they are not unfrequently 



* Mean Temp, of London 49°.5, Howard. The letters G and S denote 

 the mine being in granite or slate (primitive clay.) 



