The Interior of the Earth 



Vogt took occasion from them to dub the 

 hypothesis " an avatar of the ancient Tartarus 

 myth/' while Mohr wrote that the results ob- 

 tained in the Sperenberg boring had cruelly 

 annihilated the ancient doctrine of the central 

 heat. 



It was premature to draw from this experi- 

 ment such final conclusions, especially knowing 

 how greatly the calorific conductivity varies even 

 in apparently homogeneous formations. Even 

 at Sperenberg one measurement taken between 

 330 yards and 440 yards deep gave a degree of 

 154 yards, while the measurements immediately 

 above and below gave twenty-three and thirty 

 yards respectively. The wiser course was to 

 continue making experiments. This has been 

 done. At Schladebach, in Saxony, a boring 1920 

 yards deep was sunk. The temperature at the 

 bottom reached 56 centigrade, and the mean 

 geothermic degree was forty yards. Finally at 

 Paruchowitz, in Silesia, a boring was sunk 2200 

 yards into the ground. At the surface the tem- 

 perature was 12; at the bottom it reached 

 69.3 centigrade, giving a geothermic degree of 



thirty-seven yards. 



129 



