1884.] NATURAL SCIENCES OF PHILADELPHIA. 33Y 



in other museums, either in this country or in Europe, nor does 

 this method do justice to the collection. The same may be said 

 with regard to the Archaeological part. 



The present method is based on the actual number of speci- 

 mens, without regard to the number of trays, and is as follows : — 

 Mineral specimens, .... 6,391 



Crystallographic models, .... 6 



Models of historical diamonds, . . 15 



6,412 



representing about 500 species. 



It may be of interest to members of the Academj'- to know the 

 whole number of minerals contained in the Museum of the 

 Academy (though not strictly in the line of this report) ; with the 

 assistance of Mr. W. W. Jefferis, the specimens were counted as 

 follows : — 



Mineral specimens, Academy proper, . . 9,633 

 Lithological specimens, Academy proper, . . 1,301 



Total, • . 10,934 



W. S. Vaux collection, . . . . . 6,412 



Total, 17,346 



It will be remembered that, according to terms of the agreement 

 upon which this collection was accepted by the Academy, all 

 specimens purchased from the fund provided for increase, were 

 subject to the approval of the Curators of the Academy in con- 

 junction with the Curator of the collection. 



In making purchases, such specimens only have been bought — 



1. As represent new species. 



2. Species not represented in the collection. 



3. Species representing new localities. 



4. Such as are superior in character to those already in the 

 collection. 



Sixty specimens have been purchased during the year 1884, as 

 follows : — 



Minerals, 32 



Indian relics, 1 



Crystallographic models, ... 6 



Historical diamond models, , . .15 

 The collection has been visited by a large number of persons 

 during the past year, many of them professional mineralogists, 



