699 
1913.] NATURAL SCIENCES OF PHILADELPHIA. 
As of special importance may be mentioned: 
Freyer. Beitraege z. Geschichte europ. Schmetterlinge. 3 vols. 
Freyer. Neuere Beitraege z.‘ Schmetterlingskunde. 7 vols. 
Millais. British Diving Ducks. 
Coal Resources of the World, 2 vols., text and folio Atlas. 
A specially illustrated copy of the Centenary volume of the 
Journal, bound in two volumes, has been presented by the Record¬ 
ing Secretary. They contain samples of all the documents and cards 
used in connection with the centenary celebration, photographs of, 
and autograph letters from everyone taking part in the meetings or 
contributing communications to the volume, a photograph of the 
dining hall with seated guests, lists of subscribers to the general 
expense fund and to the dinner fund, proof and plates of an omitted 
paper, statistics of distribution, text of the secretary’s unpublished 
“Reminiscences,” and a copy of the printers’ bill. These volumes 
cannot fail to be of increasing interest as the years go on. They 
have been presented on condition that they be kept under lock and 
key and inspected only in the presence of an officer of the Academy 
or an attache of the library. 
Five hundred and eight volumes have been bound. 
The stack has been thoroughly cleaned and the windows so pro¬ 
tected as to minimize the access of dust. 
We are indebted to Miss A. L. Fries for a collection of one hundred 
and thirty-one letters addressed by American and foreign naturalists 
to the Rev. David Lewis De Schweinitz with his certificates of 
membership in the Academy and the Linnean Society of Paris. 
The letters mostly relate to the work of Dr. De Schweinitz on the 
fungi. 
In compliance with the law, 199 duplicate pamphlets and 58 maps 
have been returned to the U. S. Department of Agriculture. 
A proposition to alter the by-laws so as to permit of the loaning 
of books, which had been long under consideration by the Council, 
was reported on negatively. 
It gives me pleasure to again acknowledge my indebtedness to my 
assistants, William J. Fox and Furman Shepherd Wilde, for the 
conscientious and intelligent discharge of their duties. 
Edward J. Nolan, 
Librarian. 
REPORT OF THE CURATORS. 
During the past year the work of the museum staff has been 
mainly devoted to completing and improving the arrangement of 
