769 
1901.] NATURAL SCIENCES OF PHILADELPHIA. 
REPOET OF THE BIOLOGICAL AND MICROSCOPICAL 
SECTION. 
The Section has held the usual meetings during the year with 
increased membership. It has lost by death a valued member, 
Mr. David S. Holman. 
The Conservator reports that the apparatus and slides belonging 
to the Section are in fair condition, and some progress has been 
made in cataloguing the latter. 
Additions during the year include thirty-six slides of wood sec¬ 
tions purchased and twenty-six volumes, principally of microscopi¬ 
cal journals, presented by Mr. John C. Wilson. 
At a joint meeting with the Biological Society of the Univer¬ 
sity of Pennsylvania, the latter was represented by Prof. Conklin, 
who spoke upon “ Fertilization and Inheritance,’’ and the Section 
by Mr. Frank J. Keelev, who gave a history of the “ Develop¬ 
ment of the American Microscope.” Dr. Morris also spoke upon 
the “ Theory of Vibration.” 
Communications have been made by Mr. Palmer on Spirogyra 
and desmids; by Mr. Keeley on rock-inclusions, various appliances 
of the microscope, and the Abbe diffraction theory; by Mr. Wool- 
man on artesian well deposits; by Mr. Boyer on diatoms; by Dr. 
Stewart on white blood corpuscles and bacteria, and by Dr. Morris 
on pathology. 
At the meetings with the Academy Dr. Benjamin Sharp spoke 
upon the “ Food of the Cod;” Dr. Pilsbry on the “ Relationships 
of the Genus Neobeliscus ;” Mr. Keeley on the “ Structure of 
Diatoms” and “Colored Illumination,” and Drs. Ravenel and 
McCarthy on the “ Pathology and Treatment of Rabies.” 
The following officers were elected for the ensuing year: 
Director, 
Vice-Director, 
Treasurer, 
Conservator , . 
Corresponding Secretary, 
Recorder, 
J. Cheston Morris, M.D. 
T. Chalkley Palmer. 
Lewis Woolman. 
Frank J. Keeley. 
Silas L. Schumo. 
Charles S. Boyer. 
Charles S. Boyer, 
Recorder. 
