1911.] NATURAL SCIENCES OF PHILADELPHIA. 599 



The assistance rendered by Dr. Amos P. Brown, who has co- 

 operated with the Curator in working up collections made by him 

 in Jamaica, is gratefully acknowledged. 



In the absence of a palaeontologist, the Curator has, with the 

 volunteer assistance of Dr. A. P. Brown, taken up much-needed 

 work on the palseontological collection, which, on account of the 

 large number of type specimens, is one of the most important in 

 America. Various brief publications on Miocene and Cretaceous 

 Mollusca have grown out of the work done on the collections. Dr. 

 Brown has collaborated in studies on the Oligocene fauna of the 

 Isthmus of Panama. The results have been published in the Pro- 

 ceedings, and the material, comprising numerous types, placed in 

 the Museum. 



H. A. PlLSBRY, 



Special Curator Department of Mollusca. 



Report of Curator of William S. Vaux Collection. 



During the past year there has been added to the William S. Vaux 

 Collections eleven specimens of minerals, which, while few in number, 

 are of exceptional value and interest. Among those deserving 

 special mention are meteorites from York County, Pa., a large twin 

 titanite from Canada, and two native silvers from Lake Superior. 



Respectfully submitted, 



F. J. Keeley, 

 Curator Wm. S. Vaux Collection. 



REPORTS OF THE SECTIONS. 

 Biological and Microscopical Section. 



Nine stated and several informal meetings of the Section have 

 been held during the year, with the usual attendance. Two new 

 members have been added and one resignation has occurred. 



The work of the year has consisted of miscellaneous communica- 

 tions, the most important of which, Micro-Spectroscopic Observations, 

 by Mr. F. J. Keeley, was presented at the meeting with the Academy 

 and is published in the Proceedings. 



The Conservator reports an addition to the Museum of three 

 hundred and ten slides of microscopic objects, the gift of Dr. J. 

 Cheston Morris. 



