NATURAL SCIENCES OP PHILADELPHIA. 



515 



List of Ferns. 



POLYPODINE/E. 



Polypodhun vulgare. 



hexagonopterurn. 

 Allosorus atropurpureus. 

 Pteris aquilina. 

 Adiantum pedatum. 

 Woodwardia angustifolia. 



" Virginica. 



Camptosorus rhizophyllus. 

 Asplenium pinnatifidum. 

 " trichoinanes. 



' ebeneum. 



" angustifolium. 



thelypteroides. 

 " filix foemina. 



Dicksouia punctilobula. 

 Woodsia obtusa. 



" ilvensis. 

 Cystopteris fragilis. 



! 

 U 

 (( 



I . 



Aspidium thelypteris. 

 " noveboracense. 



spinulosum. 



v. dilatatum. 



cristatum. 



marginale. 



acrostichoides. 

 Onoclea sensibilis. 



Osmundine^e. 



Botrychiuni lunar ioides. 

 Lygodium palmatum. 

 Osmucda regalis. 



' ' claytoniana. 



" cinnamomea. 



Botrychium Virgiuicum. 

 Ophioglossum vulgatum. 

 Species 32. 



In addition. 

 Echium vulgare. 

 Aster longifolius. 



Nov. IZth. 



Mr. Lea, President, in the Chair. 



Thirty-two members present. 



The following papers were presented for publication : 



" Description of a new species of Cassidulus from the Cretaceous 

 formation of Alabama, by Wni. M. Gabb." 



"Description of a new Genus and species of Amorphozoa from the 

 Cretaceous formation of New Jersey, by Wm. M. Gabb." 



And were referred to a Committee. 



Dr. Rogers exhibited some experiments to show the decomposing power of 

 CarbonicAcid in solution, on bodies containing alkalies and alkaline earths. 

 Specimens of several kinds of glass, mica and trap rock in fine powder, placed 

 on filters, were treated with a solution of carbonic acid dissolved in water. 

 A notable proportion of the alkaline bases was dissolved, as was shown by its 

 action on turmeric paper. Dr. Rogers referred to the bearing of this fact in 

 Geology, especially the absence of alkalies in the ashes of coal and the disin- 

 tegration of rocks. 



Nov. 20th. 

 Mr. Lea, President, in the Chair. 



Fifty members present. 



Dr. Fisher exhibited a specimen of Peat, obtained by Mr. J. C. Trautwine 

 on the Atrato River, from a bed of leaves. The bed was about thirty feet 

 thick, and the specimen exhibited was taken from about fifteen feet below the 

 surface. On the surface the leaves were fresh, but were gradually changed 

 at different depths, so that the bottom of the bed closely resembled bituminous 

 coal. 



Dr. Rogers exhibited Prof. Way's electric light, produced by the ignition of 



1860.J 



