On the Subdivisions of Science. 211 



Coalburg and has been worked opposite that village on the 

 northeast bank of the river. Its thickness there is incon- 

 siderable, barely three feet, and its quality poor. At 

 Cannelton Mr. Ridgway observed a limestone below this 

 coal, which he identifies with the Ferriferous of Pennsylvania. 

 This is not exposed at or opposite Coalburg and I did not 

 observe it at Cannelton. If Mr. Eidgway be accurate in his 

 determination of the limestone, the "Gas coal" is very prob- 

 ably the Kiltanning of Pennsylvania (No. IV of the Ohio 

 section) . In this case the persistent seam a short distance 

 below the limestone is the equivalent of the Ohio No. III. 



The coals below these belong to the lower division of the 

 group, which I had no opportunity to examine. They are 

 said to be well exposed in the gorge of New river. 



The dip of the strata below the Falls of Kanawha to 

 Charleston is somewhat less than 30', but below Charleston 

 they are horizontal, or at least the dip is inappreciable. 

 Above the Falls it is very undulating and one may expect to 

 find one or more broad anticliuals between the Falls and 

 Big Sewell Mountain. 



P. S. The map (plate xii.) accompanj^ing this paper was 

 prepared for the article on the Upper Goal Measures (pp. 

 226-252), but was not completed in time to appear with it. 



XXVI. — On the Subdivisions of Science and their Classi- 

 fication. 



By LOUIS ELSBERG, M.D. 



Read February 3, 1873. 



• 



The distinguishing characteristics of man are centred in 

 his ability to "know" and to "do." Knowledge, accumulated 

 and systematized, has become science; in a somewhat simi- 

 lar manner action has given rise to art. It would lead me 



