1888.] 



XATURAL SCIENCES OF PHILADELPHIA. 



443: 



The growth of the collection, since it came into the Academy's 

 possession is as follows : — 



Specimens iiurchased in 1884, ..... 60 



Specimens purchased in 1885, 

 Specimens purchased in 1886, 

 Specimens purchased in 1887, 

 Specimens purchased in 1888, 



Total, 



104 

 114 



156 

 102 



536 



The aggregate cost of the 536 specimens has been . $2506.80 



Most worthy of mention among the additions of the year are a 

 fine specimen of Calcite in Malachite, a superb Vanadinite and 

 Wulfenite from Arizona ; these specimens, in color and crystalo- 

 graphic form, are the finest ever brought to the city. Other inter-^ 

 esting specimens are a single crystal of Gadolenite 6 inches in width 

 by 9 inches in length, said to be the largest crystal ever found ; 

 fine large crystals, of Troostite, Tryolite, Erenite, Opal, Turquoise^ 

 Thenardite, Troua, Hyalite, Colemauite and others. 



A number of species not heretofore represented in the collection 

 have been added. 



The visitors to the collection have not been as numerous as in 

 former years ; it may be remarked, however, that those who do visit 

 it are i:)ersons especially interested in mineralogy or archaeology 

 who have made use of it more for the purpose of study than for the 

 gratification of mere curiosity. 



Respectfully submitted, 



Jacob Binder, 



Curator. 



REPORT OF THE BIOLOGICAL AXD :\[ICRO- 

 SCOPICAL SECTION. 



During the year thirteen stated meetings were held with an 

 average attendance of ten members. 

 Four public lectures were given. 



The following gentlemen were elected members and contributors^ 

 Members. John T. Penuypacker, 



" Lancaster Thomas. 



