1910.] 
NATURAL SCIENCES OF PHILADELPHIA. 
685 
rearranged, together with the duplicate Hymenoptera, the collection 
of galls and the Dipterous family Stratiomvidse. 
A large part of the Micro-lepidoptera has been relaxed and mounted 
and nearly the entire series of North American Rhopalocera has been 
rearranged. Much of the Hemiptera has been recently studied and 
named by a specialist. The incorporation of the additions to the 
collection has taken much time, and the Section is indebted to those 
students not directly responsible for the work. 
Mr. Rehn has had charge of the Orthoptera and Dr. Calvert has 
continued to care for the large and valuable collection of Odonata. 
Mr. E. T. Cresson is working on the arrangement of parts of the col¬ 
lection of Hymenoptera. 
The Conservator represented the Academy at the First International 
Entomological Congress, held in Brussels, Belgium, last August. 
This meeting demonstrated the great importance of entomology 
from a practical or economic standpoint, particularly that branch of 
economic entomology relating to the dissemination of disease by 
insects and the carriage of germ diseases to man. 
The following persons were elected officers to serve for the ensuing 
year: 
Director . 
Vice-Director . 
Treasurer . 
Conservator . 
Recorder . 
Secretary . 
Publication Committee. 
Philip Laurent. 
H. W. Wenzel. 
E. T. Cresson. 
Henry Skinner. 
Henry Skinner. 
E. T. Cresson, Jr. 
E. T. Cresson, 
E. T. Cresson, Jr. 
Botanical Section. 
Five double wooden cases, which had to be moved from the north 
room owing to the change of windows on Race Street, were transferred 
to the local herbarium, the plants contained in them being moved 
into new dust- and insect-proof metal cases. But little work has been 
done on the arrangement of the herbarium owing to the remodelling 
of the building, though the preparation and mounting of specimens 
has gone on with but little interruption. 
Some important additions have been made to the collections during 
the year. The Conservator spent about a month in Jamaica and brought 
back a collection of more than 850 sheets. Mr. Joseph Crawford spent 
