1907.] 
NATURAL SCIENCES OF PHILADELPHIA. 
573 
Mineralogical and Geological Section. 
The Section has this season continued its meetings and excursions 
with renewed vigor and success. 
There have been nine meetings, with an average attendance of ten. 
Communications were made by Mr. Lynwood F. Garrison on gold in 
pegmatite and related rocks, and on metallic sulphides in volcanic tuffs; 
by Mr. E. T. Wherry on luminescent minerals, and on his summer 
observations in northern New Jersey; by Mr. T. Chalkley Palmer on 
the geography and geology of the region around Richmond, Ya. ; by 
B. S. Lyman on a trip to the Philippines, and on a new rock-section 
grinding machine; by Dr. Florence Bascom on some Mexican volca- 
noes; by Dr. William J. Sinclair on the geology of the Yosemite Valley. 
There were a number of shorter communications, besides active discus- 
sions. 
There were nine field excursions, with an average attendance of 
over twenty-eight. The parties examined : (1) The structure of 
Plymouth Valley, between Camp Hill and Chestnut Hill, Montgomery 
County; (2) The crystalline rocks and their minerals near Media, 
Delaware County; (3) The structure of Plymouth Valley, between 
Fort' Washington and Glenside, Montgomery County; (4) The crys- 
talline rocks and their minerals between Swarthmore and Lansdowme, 
Delaware County ; (5) The Cambrian and Precambrian rocks between 
Edge Hill and Paper Mills, Montgomery County; (6) The New Red 
rocks in the Perkiomen Valley, Montgomery County; (7) The crystal- 
line rocks between Chester and Morgan Station, Delaware county; (8) 
The New Red and Cambrian conglomerates between Yardley and Falls- 
ington, Bucks County; (9) The crystalline rocks and their minerals 
between Bethayres and Bustleton, Montgomery and Philadelphia 
Counties. The excursions are occasionally enlivened by interesting 
and instructive discussions of the phenomena observed. 
The membership of the Section has increased by two associates, at 
least one of whom will doubtless next month become a member. 
Another associate has already this year become a member. 
The following officers of the Section have been elected for the year 
1908: 
Director, 
Vice-Director, . 
Recorder and Secretary, 
Treasurer, 
Conservator , 
Benjamin Smith Lyman. 
George V aux, Jr. 
Edgar T. Wherry. 
Miss Emma Walter. 
Frank J. Iveeley. 
Respectfully submitted by order of the Section, 
Benjamin Smith Lyman, Director . 
