52 
slightly changed. Some of the great mammals of the pre- 
glacial period bade defiance to these changes, as the Mastodon 
and Elephant, both of which could endure great changes of 
climate, and the Mammoth, we know, was defended from 
cold by a thick coat of hair and wool. We find its remains 
imbedded in peat-bogs and marshes where they were mired 
and suffocated and it is even claimed that here, as in Europe, it 
was contemporaneous with man. 
After the conclusion of the reading of Dr. Newberry’s 
paper, Prof A. M. Edwards made some remarks on the 
microscopical examination of the fresh water Infusorial 
deposits of the west, and classification of these and the marine 
strata, containing microscopical organisms which he had 
adopted. Besides the recent deposits, made up for the most 
part of muds of both marine and fresh water origin, we have 
Lacustrine sedimentary deposits, now forming in lakes and 
ponds, and which belong to the present or Post Tertiary 
Period. The Sub-Plutonic or lake deposits of the west, only 
found as yet in that part of our continent where voleanic 
action has prevailed, and the marine deposits of the coast 
Range in California, Virginia and Maryland on the Atlantic 
coast, Japan, Paytain Peru, Moron in Spain, the Island of 
Jutland in Denmark, and the Islands of Trinidad and 
Barbadoes, all of which were Miocene Tertiary. A full 
exposition of this subject, would be published in a future 
volume of the California Geological Survey, upon which he 
was now engaged. 
May 28, 1870. 
The President in the chair. Twenty-two persons present. 
Prof, A. M. Edwards, reported upon two specimens of 
plants referred to him, and supposed to have growing upon 
them microscopic Fungi. On one of them he had seen indi- 
