ADEN SERIES OF VOLCANIC ROCKS 193 



But all subterranean waters in the neighbourhood of 

 ZuUa appear to have an unusually high temperature. 

 The water in some of the wells at Komayli was decidedly 

 warmer than that in others when they were first dug ; 

 and in a well sunk by the Punjab Pioneers about five 

 mUes from the sea, in the plain near the line of railway 

 made by the army from ZuUa to Komayli, the tempera- 

 ture was about lOSV considerably higher than the 

 average in air. The abundance of hot springs in the 

 Danakil country has been noticed by M. Eocher d'H^ri- 

 court and others. 



' I have omitted to keep a record of the exact temperature, which was 

 determined by Dr. Cook. 



