Jult, 1844] 75 



tinted streak of plumbago as conclusively fixing the character of 

 the specimens under consideration. 



The occurrence of plumbago in numerous localities associated 

 with coal, was alluded to, and the fact was noticed, that in these 

 cases the beds of altered or graphitized coal, are generally in close 

 proximity with igneous rocks. 



This natural conversion of coal into plumbago, with the artificial 

 production of it in the iron furnace, the gas retort and other similar 

 situations, together with its existence in primary rocks, or in the 

 fissures of adjacent sedimentary rocks, appear to point to a common 

 origin of the material in all these cases. 



Prof. J. proposed to give at a future meeting some further illus- 

 trations of the subject. 



Resolutions were adopted, accepting a proposal from Dr. 

 Morton to purchase from the Academy for a proper con- 

 sideration, the remaining half of the range of cases in the 

 South flying-gallery, for the purpose of accommodating an ad- 

 ditional portion of his collection of Crania — and also authori- 

 sing the Curators to have erected forthwith, a similar range 

 of cases for books in the North flying-gallery. 



Stated Meeting, July 23, 1844. 

 Vice President Morton in the Chair. 



DONATIONS TO MUSEUM. 



Two finely prepared specimens of Rana ,from the Island 



of Dominica. Presented by Mr. Wm. L. Bispham, of 

 Philadelphia. 



Leaves and seed-vessels of Alpinia nutans, and a portion of 

 the milky juice of the Galactodendron utile, or Cow-tree 

 of South America. Presented by Miss Percival, of Phila- 

 delphia. 



DONATIONS TO LIBRARY. 



A Geological Map of the Western States; and a concise 

 description of the Geological formations, &c, of the Western 

 States, designed as a Key to the Map. By Byrem Law- 

 rence. From Dr. Morton. 



