332 PROCEEDINGS OF THE ACADEMY OF [1884. 



intended to further complete this department by a serial exposi- 

 tion of the rock masses about Philadelphia, and by the prepara- 

 tion of a relief map illustrative of the geology of the city and 

 its immediate surroundings. 



The work of labeling and mounting the Wm. S. Yaux collec- 

 tion of minerals, comprising upwards of 6412 specimens, has 

 been completed ; a report of progress in this department, pre- 

 pared by the special Curator, Mr. Jacob Binder, is herewith 

 appended. 



One of the most striking accessions made to the Museum 

 during the past year, is the collection of insect and aranead archi- 

 tecture, deposited by one of the Yice-Presidents of the Academy, 

 Dr. H. C. McCook. It is, doubtless, the most complete of its 

 kind in this country, and may be considered to be, in many 

 respects, unique. A valuable collection of fishes from the 

 southern and western waters of the TJ. S., made by Prof. D. S. 

 Jordan and Mr. Seth E. Meek, has been added to the Ichthyolo- 

 gical department. 



Various alterations have been made during the current year in 

 the ground floor of the Academy building, but these require no 

 special consideration. Specimens from the Museum have been 

 loaned for study to the Smithsonian Institution, to Prof. James 

 Hall, of Albany, Prof. R. P. Whitfield, of New York, Prof. 

 W. B. Scott, of Princeton, and Mr. Dobson, of London, who 

 have severally rendered service to the Academy by the redeter- 

 mination or description of the forms that passed through their 

 hands. 



The Academy has during the year benefited through the 

 services of five Jessup Fund beneficiaries, who, apart from 

 their studies, have in various ways cooperated with, or assisted, 

 the Curator-in-charge, who hereby acknowledges his thanks. The 

 Curator-in- charge also takes this opportunitj^ of acknowledging 

 his special indebtedness to Mr. Alan F. Gentry, who, during 

 the greater part of the year, has most efficiently acted as his 

 assistant. 



Very respectfully, 



Angelo Heilprin, 



Gurator-in-charge A. N. S. 

 Joseph Leidt, 



Chairman Board of Curators. 



