8 [February, 1844. 



tion that the valuable library had been rescued from the 

 flames. 



The Corresponding Secretary read a letter from the Secre- 

 tary of the Linnean Society of London, dated November 23, 

 1S43, acknowledging the reception of Nos. 26 to 29 of the 

 Proceedings of the Academy. 



On motion of Professor Johnson, Resolved, That the Pub- 

 lication Committee be authorised to present to Sir George 

 Von Jaeger, of Wnrtemberg, in Germany, the 2d Part of 

 Vol. S of the Journal of the Academy . 



Stated Meeting, February 13, 1844. 

 Vice President Morton in the Chair. 



DONATIONS TO MUSEUM. 



Fine specimen of Fluate of Lime, from Lowville, New- 

 York. Presented by Mr. W. M. Rice: 



Specimen, of large size, of Sulphuret of Copper, from Penn- 

 sylvania. From Dr. James Mease. 



Fossil fucoid impressions, from Mifflin county, Pennsylvania. 

 Deposited by Dr. Mease. 



Professor Johnson communicated some observations in 

 relation to the properties and habitudes of different varieties 

 of coal. 



1. He gave the results of some recent analyses of coal, which strongly 

 confirm the position which he had previously advanced, viz.: that in coals from 

 the same coal district, and where that part of the mineral substance which is 

 combustible may be considered as similarly constituted, the density of different 

 specimens may be considered as the index to their relative impurity. 



