PAL8I0NT0L0GICAL REPORT OF GEOLOGICAL STJRVET. 565 



square miles, with an average thickness of all the coal seams about 

 equal to those of the Newcastle district. 



The superiority of coal as a fuel will be better understood when we 

 consider, that one square mile of forest, containing twenty thousand 

 trees, averaging two cubic yards of solid wood, would be equal to one 

 acre of coal six feet thick. One hundred pounds of coal, occupying 

 about one and a half square feet, will evaporate 1,200 pounds of water, 

 equal to 150 gallons; while 100 pounds of well dried wood, occupy- 

 ing more than double this space, will evaporate only 700 pounds of 

 water, equal to about 88 gallons; and six gallons of water evaporated 

 in an hour is equal to a horse power. 



E. T. COX, 



Assistant Geologist. 



