43 



A letter was received from the Treasurer of the " lnsti- 

 tut Historique" of Paris, acknowledging the receipt of the 

 Society's Journal. Accompanying the letter was the com- 

 plete collection of the Journal of that Institute for eight 

 years. Monsieur Renzi, in behalf of the Institute, requests 

 in future an exchange of publications. 



A letter was received from the Secretary of the Zoologi- 

 cal Society of London, returning the thanks of that Society 

 for the third volume of our Journal, and enclosing their last 

 Annual Report. 



Adjourned, 



F. A. EDDY, Rec. Sec. 



October 25, 1841. 

 Vice President, Dr. C. T. Jackson, in the Chair. 



VERBAL COMMUNICATION. 



Professor Johnson of Philadelphia, by request, made some 

 statements respecting the fossils presented by him at the 

 last meeting of the Society. 



The sample of foliated or micaceous Galena then presented, from 

 a locality 2 1-2 miles below Sunbury in Pennsylvania, on the left 

 bank of the Susquehanna, was stated to occur in an upward curva- 

 ture of the limestone bed in which it is found, which, like other 

 strata of the formation in that part of Pennsylvania, has been cut 

 through by the Susquehanna, in excavating its channel. The lead 

 ore occurs in fissures from one to two hundred feet above the bed 

 of the stream, and at a part where the bank is almost perpendicu- 

 lar. These fissures doubtless descend below the bed of the river, 

 but the height at which they are worked is that just indicated. 

 Through these fissures, which are four or five in number within the 

 distance of as many hundred yards, the sulphuret appears to have 

 been sublimed from below, and to have lodged in the cavities of 

 the limestone, mixing with the loose fragments of the latter, and 

 forming very irregular masses. Some carbonate of lead also 

 occurs with the galena. That the lead ore has been sublimed into 



