254 



GEOLOGY OF THE COMSTOCK LODE. 



Table VI.— ROSE BRIDGE COLLIERIES, AT INCE, NEAR WIOAN. 



(Obsoi-vations given ou the authority of John Arthur Phillips, esq. It is not stated whether the temperatures are 

 those of the rock or the w:iter. The original data for depth, in fathoms, are contained in column 2. Observations on 

 Metalliferous Dt-pnsits and Subterranean Temperatures, by W. J. Henwood. ]>. 775.] 



= 56.0. 6 = 0.0149 ±0.0004. 



iof:iii observation =r ± P.O. 



