GEOLOGICAL SOCIETY OF PENNSYLVANIA. 



385 



It has been deemed proper here to adjoin a copy of 

 one of the monthly statements of work performed in Corn- 

 wall, by the various steam engines at the numerous mines, 

 the details of which cannot fail to prove interesting; and 

 the more so, as it is not presumed that a similar table has 

 yet been published in the United States 



I.— 2 Y 



