194 



[Dec. S, 



feature, viz : the kettle -shaped isolation of the subordinate sj'nclinals, 

 which ride upon the crests of anticlinals at their ends. In fact, the views 

 which we have hitherto held of the general continuance and parallelism of 

 the sub-basins receives here a rude shock. The greatest irregularity pre- 

 vails in the arrangement of the mutually interlocking sub -anticlinals and 

 sub-synclinals. At the same time it is most interesting and satisfactory to 

 see that in this respect the dimpled structure of the broad and shallow bi- 

 tuminous basins is reproduced in the narrow and deep anthracite basins. 



The crushing, sidewise thrusting action from the south against the An- 

 thracite coal region is admirably illustrated by this model, which is only 

 the first of a series, to be extended lengthwise of the Mahanoy and Shamo- 

 kin field as the Geological Survey advances. 



Stated Meeting, December 3, 1880. 

 Present, 19 members. 



President, Mr. Fraley, in the Chair. 



Letters 6f envoy were received from the Royal Observa- 

 tory, Greenwich, Dec. 1880 ; and the Board of Commission- 

 ers of the 2d Geological Survey of Penna., Harrisburfij, ISTov. 

 25, 1880. 



Donations for the Library were received from the R. 

 Accademia dei Lencei, Rome ; Zoologischer Anzeiger, Leip- 

 sig ; Geographical Society, Annates des Mines, and Revue 

 Politique, Paris ; Society of Commercial Geography, Bor- 

 deaux ; R. Astronomical Society, and Mature, London \ 

 American Academy of Medicine, and Editors of the Inter- 

 national Review, New York ; Academy of Natural Sciences, 

 Medical News, Engineers' Club, Journal of Pharmacy, and 

 Geo. Hamilton, M. D., Phila. ; and the Board of Commis- 

 sioners of the 2d Geological Survey of Pennsylvania. 



A letter from Mrs. Haldeman, enquiring about the memoir 

 and relics for illustration by the late Prof. Haldeman was 

 read, and on motion it was 



Besolved, That the Curators be authorized to deposit the cards on which 

 these relics are arranged, in the Museum of the Academy of Natural 

 Sciences, and to take a receipt for the same, as in the case of other curiosi- 

 ties belonging to this Society there deposited. • 



