RECORDS OF MEETINGS 40» 



SECTION OF GEOLOGY AND MINEEALOGY. 



March 7, 1910. 



Section met at 8:35 p. m., Vice-President George F. Kunz presiding. 

 The minutes of the last meeting of the Section were read and approved. 

 The following programme was then offered : 



Paul Billingsley, Structure, Origin and Stratigraphic Sig- 



nificance OF THE ShAWANGUNK GrIT. 



A. C. Boyle, Jr., Problems Connected with the Occurrence 



OF Gypsum in the Bully Hill and Ris- 

 ing Star Mines, California. 

 Edwin W. Humphreys 



and Alexis A. Julien, The Preglacial Decay of Schists at West- 

 chester Avenue and Boulevard, Bronx, 

 New York City. 

 Section then adjourned. 



Charles P. Berkey, 



Secretary. 



SECTION OF BIOLOGY. 



March 14, 1910. 



Section met at 8 :15 p. m., Vice-President Davenport presiding. 



The minutes of the last meeting of the Section were read and approved. 



The following programme was then offered: 



Alexander Petrunkevitch, Relation Between Species and Indi- 

 vidual IN THE Struggle for Exist- 

 ence. 



Elvira Wood, A Case of Apparent Reversion Among 



Gastropods. 



Ignaz Matausch, The Preparation of a Museum Ana- 



tomical Model. 



Summary of Papers. 



Dr. Petrunkevitch tried to show from examples taken from the groups 

 of spiders and insects that the advantage of the individual is often op- 

 posed to the advantage of the species. Structures and habits dangerous 

 to the individual but of use to the species are not uncommon. Their ex- 

 istence proves that the individual is "enslaved" by the species, which con- 



