1899.] NATURAL SCIENCES OF PHILADELPHIA. 9 



1894 Van Deker (Honduras), 45 



1895 Mrs. M. J. Chase (mainly Tiochilidte), ... 120 

 1895 T. H. Montgomery (Pennsylvania), .... 77 

 1895 S. M", Rhoads (Pennsylvania and Xew Jersey), 680 



1895 S. N. Rhoads (Tennessee), 58 



1896 Benjamin Sharp (Alaska) 105 



1896 Dr. A. Donaldson Smith (Somaliland, East 



Africa), 138 



1896-97 R. T. Young (North America), 110 



1898 G. and J. E. Farnum and Dr. A. D. Smith 



(Mongolia), 58 



1887-97 Miscellaneous, 658 



1898 Turnbull Collection (X. A.), 800 



1899 Josiah Hoopes' collection (N. A.), .... 7,250 



41,660 



1897 On deposit Stone collection (Pennsylvania and 



New Jersey), 1,800 



Total specimens, 1898 48,460 



As the collection was left by Dr. Wilson and John Cassin it was 

 nearly all mounted and on exhibition in museum cases in accord- 

 ance with the ideas prevalent at that time. 



Since then, however, it has been clearly demonstrated that 

 mounted specimens have but a limited existence, and sooner or later 

 succumb to the ravages of light and dust, and for years the bulk 

 of all the large collections has been preserved as skins in air-tight, 

 light-proof cases. In accordance with this idea, the rearrangement 

 of the Academy's collection was begun in 1891, and all the types 

 and other valuable specimens as well as many duplicates have been 

 unmounted, and placed in tight cabinets, leaving an ample exhibi- 

 tion series of about 10,000 specimens. Nearly all the recent addi- 

 tions have been skins and have been added to the study series. 



In the list of type specimens contained in the Academy collection 

 which follows, the species are arranged according 1o authors. In 

 order to make the paper more complete, however, mention is made 

 of every author who described new species of birds in the Acad- 

 emy's publications, whether their types are in the collection or not, 

 and the present location of the tyi:)es, so far as known, is indicated. 



