354 PROCEEDINGS OF THE ACADEMY OF [DeC, 



The following officers and committee were elected to serve for 

 1918: 



Director Philip Laurent. 



Vice-Director R. C. Williams, Jr. 



Treasurer E. T. Cresson. 



Conservator Henry Skinner. 



Secretary J. A. G. Rehn. 



Recorder E. T. Cresson, Jr. 



Publication Qmnmittee E. T. Cresson, 



Philip P. Calvert, 

 E. T. Cresson, Jr. 



E. T. Cresson, Jr., Recorder. 



Botanical Section. — At the annual meeting of the Botanical 

 Section, held November 19, 1917, officers for the ensuing year 

 were elected as follows: 



Director Dr. Ida A. Keller. 



Vice-Director Joseph Crawford. 



Recorder Dr. John W. Eckfeldt. 



Conservator and Treasurer Stewarclson Brown. 



Stewardson Brown, Conservator. 



MiNERALOGicAL AND GEOLOGICAL SECTION. — The Section held 

 three meetings with the usual interested attendance. Prof. Florence 

 Bascom discussed the Geology of Mt. Desert. Miss Emma Walter 

 called attention to remarkable erosion of limestone near Devault. 

 There was also discussion of isostasy and the Himalayas, and other 

 subjects. 



There were four field excursions, with an average attendance of 

 about seventeen. The parties visited: 1. The crystalline rocks 

 near Unionville and Northbrook, Chester County; 2. The crystalline 

 rocks near Rocky Run and Dismal Run, Delaware County; 3. The 

 Cambrian quartzites and the limestones between Westtown and 

 Brinton's Bridge, Chester County; 4. The limestone exposures 

 between Devault and Malvern, Chester County. 



The following were elected officers of the Section for 1918: 



Director Benjamin Smith Lyman. 



Vice-Director F. J. Keeley. 



Recorder and Secretary...., W. B. Davis 



Treasurer , W. B. Davis. 



Conservator F. J. Keeley. 



Benjamin Smith Lyman, Director. 



