89 
Hon. E. G. Squier called attention to the advisability of 
the Society having a course of Public Lectures, to be delivered 
under its auspices during the present winter, and on motion, 
a Committee, to inquire into this matter, was appointed. 
Such Committee to report at the next meeting of the 
Society. 
Mr. G. M. WILBER exhibited a specimen of Green and 
white mottled Marble, from near Saratoga, N. Y., which was 
recognized by Prof: Edwards, as consisting of Hbozion 
Canadense. The specimen was referred to Prof Lee 
for examination and report. 
- Mr. J. W. Warp exhibited a specimen of a White Mineral 
which, he stated, came from Delaware, and was represented 
to consist of finely-pulverized Mica agglutinated into a mass. 
No chemical examination of it had been made and a 
microscopical examination revealed no traces of organic 
remains, only irregular granules. 
THE PRESIDENT remarked that the determining the mode 
of genesis of such deposits as this one was of great impor- 
tance geologically, and the specimen was referred to Prof. 
Edwards for microscopical and chemical analysis if necessary. 
Pror. D. S. Martin exhibited a specimen of Electro- 
Silicon, an article found in commerce and used as a polishing 
powder. 
Pror. A. M. Epwarps remarked that this was made up 
of the siliceous skeletons of Diatomaceze and in the natural 
state was a rather hard white rock; for use it was crushed. 
He was strongly of opinion that the specimen exhibited by 
Mr. Ward was of the same character. But he would 
examine it and report at a subsequent meeting. 
The President, Dr. J. S. NEwBErRY, read the following 
letter from Professor C. F. Hartt, relating to the Geology of | 
Brazil. 
