84S 
PROCEEDINGS OF THE ACADEMY OF 
[Dec., 
REPORTS OF THE SECTIONS. 
Mineralogical and Geological Section. 
The Section has this year kept up its meetings and field excursions 
even more zealously than last year, with about double the number of 
communications, one-third larger attendance on the meetings, 
one-half more on the excursions, and an increase of more than 
one-quarter in membership. 
There have been nine meetings, with an average attendance of over 
11. Communications were made by Miss Emma Walter, on old 
stream-beds; by B. S. Lyman, on the immense time indicated 
by erosion; by Prof. B. L. Miller, on graphite occurring in Chester 
County, Pa.; by B. S. Lyman, on the Bechtel graphite mine, near 
Boyerstown, Berks County, Pennsylvania; by Miss Mary S. Holmes, 
on the Virginia Natural Bridge; by B. S. Lyman, on topography 
an aid to geology; by Miss Emma Walter, on clay near Saylorsburg, 
Monroe County, Pennsylvania; by Mr. F. J. Kceley, on the trap of 
Cape Ann, Massachusetts; by Miss Mary S. Holmes, on some prob- 
lems suggested by the excursion along the Perkiomen; by Mr. T. 
Chalkley Palmer, on serpentines of Delaware County, Pennsylvania; 
by Mr. F. J. Iieeley, on serpentines under the microscope; and about 
20 shorter communications, besides various discussions. 
There were 7 field excursions, with an average attendance of 43. 
The excursions visited: 1. The crystalline rocks and their minerals, 
particularly kaolin, between Hockessin, Delaware, and Kennett 
Square, Chester County, Pennsylvania; 2. The crystalline rocks near 
Glen Mills and Lenni, on Chester Creek, and at Mineral Hill, Delaware 
County, Pennsylvania; 3. The crystalline rocks near Avondale, Strath- 
Haven, Rose Valley and Media, Delaware County, Pennsylvania; 
4. Portions of the New Red Perkasie shales and Pottstown shales and 
trap, from Lodel Creek to Spring Mountain, near the Perkiomen, and 
Schwenksville, Montgomery County, Pennsylvania; 5. Portions of the 
New Red Norristown shales and Gwynedd shales, and some of the 
gneiss southward, between Noble Station and Doylestown; 6. The 
crystalline rocks near Newtown Square, Delaware County, Pennsyl- 
vania; 7. The crystalline rocks between Newtown Square and Media, 
Delaware County, Pennsylvania. 
The membership of the Section has increased by ten in all, namely, 
seven contributors and three members of the Academy, one of whom 
became a member through his interest in the Section. The Section 
