RECORDS OF MEETINGS 309 



Charles Reinhard Fettke, The Manhattan Schist of Southeast- 

 ern New York State and its Associ- 

 ated Igneous Kocks. 



Summary of Papers 



Mr. Van Tuyl made especial reference to the geode-bearing beds of 

 Iowa, Missouri and Illinois, and presented the theory that geodes origi- 

 nated in cavities left by the solution of concretions in these beds, these 

 cavities being filled by crystallization from mineralizing solutions pene- 

 trating them, these solutions having their dissolved content replaced by 

 osmosis as it was depleted by deposition. 



The paper was discussed by Mr. Levison, Dr. Hovey and Professor 

 Grabau. 



Dr. Berkey's paper was read by Mr. G. S. Kearney, owing to Dr, 

 Berkey's absence because of illness. In this section of the paper Dr. 

 Berkey treated the origin of streaked and foliated structures which he 

 insisted was due primarily to regional disturbance and which led him to 

 regard Yonkers gneiss as essentially primary. 



A few remarks of approbation were made by Professor Grabau. 



Professor James F. Kemp gave a brief summary of a paper entitled 

 "The Manhattan Schist of Southeastern New York State and its Asso- 

 ciated Igneous Eocks," by Charles Eeinhard Fettke. 



After a collation, the Section adjourned. 



Albert B. Pacini, 



Secretary. 



SECTION OF BIOLOGY 



8 December, 1913 



Section met at 8 :15 p. m., Vice-President W. D. Matthew presiding. 

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

 The following programme was then offered : 



Henry Fairfield Osborn, Unit Characters in Heredity as They 



Appear to the Paleontologist: 



Summary of Paper 



Professor Osborn 's paper will be published in the D. S. Geological 

 Survey Monograph on Titanotheres. 



