388 Scientific Intelligence. 
methods ‘of illustration, and the vast amount of practical instruc- 
tion conveyed. 
What is chiefly wanted from such a survey is of course direct 
or indirect aid toward turt to man’s benefit the resources of 
nature, and in this case rai facilitating the mining of anthra- 
much coal is there? where is it ? at what depth? with how steep 
a dip? in what direction ? with what basins and saddles of what 
length, breadth, depth or height? in what direction would level 
drifts run? where would the coal be best attacked b y shafts or 
drifts ? what beds of rock or coal lie above or below the coal 
worked, and at what distance ? what is the situation of the coal 
with reference to water courses or other features on the surface 
of the ground ? and the like; and it is easily conceivable that it 
uld be impossible to give indications of this kind so fully and 
saiistactarily with a whole volume of words merely, as with a 
properly constructed map. Thirty years ago, Protessor Lesley 
A be d and ag into use a mothod of Repreeen ones such 
the bed upon paper, “esd shire g further to hope for in pre- 
cision and clearness and compactness of iba information. 
The method has never before nee ~— to so large @ field, 
with such completeness in minute 
* The State price of this atlas is $1.50, and it can be obtained pane in rolled 
sheets in a eth ag oard tube or folded sheets in an octavo pocket, a ing 
FE. W. n, Clerk of Survey Commission, 223 Market Street, 
+ Mr. pees pa was p in charge of the Anthracite Esc ‘a vA ngast, 
1880, when a reconnaissance of the coal fields was commenced. In the following 
November a plan was submit na te chokgh ete cays for mapping the coal basins. 
rk has bee 
January the field work in one third of the region had been completed 
