NATURAL SCIENCES OF PHILADELPHIA. 17o 



Julij 7th. 



Vice-President Bridges in the Chair. 



The following papers were presented for publication, viz : 



On three new species of Vespertilionidj^i, by John LeConte. 



Observations on the Wild Turkey, by John LeConte. 



Referred to committees, as usual. 



Mr. Lea called attention to the specimen of Chryastolite from the 

 White Mountains, presented by Dr. LeConte and himself. 



Mr. Lea also made some observations on the geology of the red sand- 

 stone formation near Gwynned, whence the specimens alluded to by 

 Dr. Leidy, at the meeting of June 16th, were obtained. It is identical 

 with that of Phrenisville, Pa. Mr. Lea alluded to the identity of u 

 large fish scale found by him at Gwynned about two years since, with 

 that figured by Emmons as Radiolepes speciosus, from the Chatham 

 series, N. C, as proving the identity of the formations. 



Juli/ lith. 

 Vice-President Bridges in the Chair. 



Dr. Corse made some remarks on the development of the spawn of 

 the Frog. He exhibited specimens which he had observed to develope 

 on the fourth day. The Rana pipiens passes a whole year in the tad- 

 pole state, which may account for its occasional comparative scarcity. 



Dr. Uhler alluded to the supposed effect of the late severe winters in 

 diminishing the numbers of the smaller reptiles. 



Dr. Ilallowell remarked that the specimen of Proteus anguinus, 

 which he has had for 13 months, was still alive and healthy, although 

 it had taken no food during that time. 



Juli/ 21st. 

 Vice-President Bridges in the Chair. 



Dr. Uhler, referring to the specimen of crystallized lead presented 

 by him this evening, remarked that he had observed pigs of lead, 

 heated in a reverberatory furnace, when near the point of fusion, become 

 so brittle that they break with a single blow; the fragments are dis- 

 tinctly crystallized. Zinc, by thus heating, becomes so brittle that it 

 may be readily powdered. 



Mr. Lesley remarked, that the specimen of lead presented has the 

 appearance of having been perfectly crystallized, and the edges of the 

 crystals re-fused. 



July 29th. 

 Vice-President Bridges in the Chair. 

 The Committee on Major LeConte's paper, " On three new species 

 of Vespertilionidte'^ reported in favor of publication ; which report was 

 adopted. 

 1857.] 



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