266 ANNALS NEW YORK ACADEMY OF SCIENCES 



Frederick A. Richardson, 15 West 67th Street, 



C. Sidney Shepard, New Haven, N. Y., 



Richard L. Walsh, 188 Eighth Ave., Brooklyn. 



The Candidates were unanimously elected by vote of the Academy. 

 The meeting then adjourned. 



W. M. Wheeler, 



Recording Secretary. 



SECTION OF GEOLOGY AND MINERALOGY. 



January 8, 1906. 



Section met at 8:30 P. M., Vice-President Hovey presiding. 

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

 The following program was then offered: 



E. 0. Hovey, Notes on the Geology and Geography of the West- 

 ern Sierra Madre. (With lantern illustrations.) 



A. W. Grabau, Discovery of the Schoharie Fauna in Michigan. 



Geo. F. Kunz, Preliminary Note on Sporadic Occurrence of Dia- 

 monds IN North America. 



Dr. Kunz then exliibited and described the volumes illustrating the 

 Bishop collection of Jades. 



Summary of Papers. 



Dr. Hovey gave a concise resume with the aid of lantern slides of his 

 observations during an expedition made for the American Museum of 

 Natural History in February, March and April, 1905. The route trav- 

 ersed lay southwestward and southward from Ciudad Juarez to Ocampo, 

 thence to the railroad again at Mifiaca. The development of bolson deserts 

 in arid regions and the similar bolson basins in the less arid regions was 

 described. These bolsons have normally no external drainage, but in many 

 cases they have been invaded by streams from without. The Aros River 

 has cut through several such inclosed basins, as is shown by the remains 

 of local conglomerates and sandstones. The section exposed in the deep 

 canyon of the Aros shows that a foundation of Cretaceous (?) limestone 



