1891. ] NEW YORK ACADEMY OF SCIENCES. 29 
U. 8. Geological Survey of reports, monographs, maps, reliefs, and 
photographs ; the large collection of Mexican rocks exhibited by 
the delegates from that country ; the remarkable Ordovician fish- 
remains recently collected and described by Prof. Walcott from near 
Cafion City, which carry back the evidences of fish-life to a horizon 
corresponding to the Trenton limestone of the Eastern United States ; 
the illustrations of mountain structure and rock-folding produced by 
Mr. Bailey Willis, by laterally compressing layers of clay and 
plaster under heavy weight; and, of extreme interest, the photo- 
graphs and specimens of glacial markings in Silurian rocks, exposed 
to view by the removal of overlying beds in Scandinavia, and ap- 
parently affording clear evidence of an early Paleozoic ice period. 
The several days’ programs were referred to further; the ex- 
haustive classification by Prof. Chamberlain of quaternary deposits, 
introductory to the discussion of that subject; the second day’s 
topie of Geological Correlation, and the views of leading specialists, 
both American and foreign, as to the methods, principles, and 
possibilities in that great field; and, later, the subject of Geological 
Cartography, with a description of Majér Powell’s account of the 
comprehensive and elaborate scheme of combined colors and patterns 
adopted for the extensive work of the U. 8. Geological Survey. 
This Prof. Martin illustrated with blackboard drawings and one of 
the new survey maps. 
Meeting adjourned. 
November 16, 1891. 
STATED MEETING. 
Mr. P. H. Duptey in the chair. About seventy-five persons pre- 
sent. . 
The minutes of the previous meeting (November 9th) were read 
and approved. 
Proressor Henry F. Osporn, of Columbia College, was pro- 
posed as a Resident Member by Dr. N. L. Brirron. 
Pror. Oris T. Mason, of Washington, D. C., was then intro- 
duced and delivered a lecture entitled 
Woman’s Part in the Earlier Civilizations, 
illustrated by numerous lantern slides. 
At the close of the discourse a vote of thanks was extended to 
the lecturer, and the meeting adjourned. 
