HEAT CONDUCTION. 



concealed. The performances of dervishes and 

 other fanatics show that in the cause of impos- 

 ture, as well as in that of faith, much pain can 

 be stoically endured. 



Putting these considerations together, and 

 dwelling especially on the fact that the heat 

 of the stones actually trodden on is not imme- 

 diately destructive to leather, we may come 

 to the same conclusion as careful observers 

 of the ceremony, that though it embodies a 

 striking combination, it includes nothing which 

 is outside the laws of nature. 



159 



