672 RECORDS. 



jade. In an ancient quariy for road material, immense masses 

 of zoisite-quartzite occurred, forming columns thirty feet in 

 height. In one of these a single mass of pure jade was found, 

 4,817 pounds in weight, which was separated and has been 

 transported to this country. This is estimated to be five times 

 the bulk of all the jade implements now stored in European 

 museums, and this implies that there is no need to search for an 

 Asiatic origin of their material. A similar deposit of nephrite in 

 place was discovered in 1897 by Professor Jascewski at Cham 

 Folga and Onot in eastern Siberia. 



Doctor Hovey presented some notes of an excursion with Pro- 

 fessor Iddings to the Yellowstone Park, with its novel oppor- 

 tunities of geologizing with a field glass. In the Black Hills the 

 picturesque Pinnacles were described, which have been produced 

 by the resistance of pegmatite-veins to erosion ; the red beds, 

 in which a layer of ancient oyster-shells was examined ; the 

 Wind Cave, with its stalactites ; and the spodumene deposits in 

 abandoned tin drifts, where the spodumene crystals lie like logs, 

 often 30 feet in length and 30 to 40 inches across, commonly 

 mined and shipped to New York for the extraction of lithia, 

 while the accompanying tin ore is thrown aside. 



Alexis A. Julien, 



Secretary. 



SECTION OF ANTHROPOLOGY AND 

 PSYCHOLOGY. 



October 23, 1899. 



Section met at 8.15 P. M., Dr. F. Boas, presiding. The 

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



The following program was then offered : 



E. L. Thorndike, Ox Mextal Fatigue. 



Living-ston Farrand, Basketry Desigx of the Salish 

 Indiaxs. 



Charles H. Judd, Movemext axd Coxsciousxess. 



Summary of Papers. 

 Dr. Thorndike stated that mental fatigue may mean either 



