First, or Southern Coal Field of Pennsylvania. 373 



It would appear from these results, that the bituminous quali- 

 ties of the coal increase with considerable regularity from Tama- 

 qua to Rattling Run, that from Mauch Chunk being an excep- 

 tion, although its excess of volatile matter may probably be at- 

 tributed to its containing a larger proportion of water. 



Specimens of two other American coals, were examined for 

 comparison with the preceding. These were from the Blossburg 

 or Tioga mines, and from Cumberland, Md. 



No. 13. Tioga. — The Tioga Coal Field is a detached portion 

 of the eastern extremity of the Great Allegany Coal Basin. The 

 specimen examined was of a medium hardness, and its fractures 

 were sometimes brilliant, sometimes altogether devoid of lustre. 

 Its ash was cream-colored, inclining to grey. 



No. 14. Cumberland, Md. — This coal is brilliant, with an 

 even fracture, and cream-colored ash, passing to grey. 



No. 15. Black Spring Gap. Grey Vein. — This remarkable 

 vein, as mentioned by R. C. Taylor, Esq. in his " Report of the 

 Stony Creek Coal Estate," is about seventeen feet thick, contain- 

 ing much fine coal, with a vein near the centre, two or three feet 

 thick, of coal of a greyish color, which has given the name to the 

 whole. The specimen of this included vein, in my possession, 

 closely resembles plumbago in appearance. It burns with little 

 flame, leaving a yellowish red ash. 



Table of analyses of coals from Pennsylvania. The numbers re- 

 fer to those prefixed to the paragraphs. 



No. Locality. 



1. Lehigh, ----- 



Another analysis of the same gave, 



2. Tamaqua, - - - . 



3. Pottsville, . . - - 



4. Pinegrove, _ _ _ - 



5. Black Spring Gap. Fish-back vein, 



6. Black Spring Gap. Peacock vein, 



7. Gold Mine Gap. Peacock vein, 



8. Rausch Gap. Pitch vein, west side, .771 



9. Rausch Gap. Pitch vein, east side, 



10. Yellow Springs Gap. Back-bone vein, .775 



11. Yellow Springs Gap. Vein next N 



of Central Ridge, 



12. Rattling Run Gap, - - - 



Vol. XL, No. 2.— Jan.-March, 1841. 48 



