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ACADEMY OF SCIENCES. 149 
to take refuge at the roots of the dried-up grass, abandoning themselves to 
death. Well developed specimens of both sexes flew rather rapidly, alighting 
very frequently, and settling on stems of trees and among decayed leaves 
closely resembling them in the color of the under side. They also invariably 
placed themselves upon the branches with the head downwards. The insects 
appeared to be confined to a very small area, as we did not meet with any 
Specimens except in the immediate neighborhood of the spot in which the 
caterpillars were taken. The crippled state of most of the imagos may be 
owing to the extremely dry state of the weather during the past month, the 
want of moisture acting upon the wings of the insect during their last stage, 
and preventing their proper development. 
S. C. Hastings read a paper on ‘‘ Phenomenal Changes of 
Climate in Past Epochs.” 
Dr. Gibbons read an obituary notice of Marshall C. Hastings. 
Reeutar Meerina, Avaust 2, 1875. 
Vice-President Edwards in the chair. 
Thirty-five members present. 
The following new members were elected: Dr. G. King, Dr. 
F. W. Godon, A. W. Crawford, Pembroke Murray, Wm. Eim- 
beck, Jas. L. King. 
Donations to Museum: Fossil bone from Tanitos Creek, San 
Mateo County, California, W. S. Downing. Fossil shells from 
Pescadero, from Milo Hoadley. Fifteen species of Unionidw 
from W. G. W. Harford. Textile plants from various localities, 
from Geo. W. Dent. Specimens of ores, from Joseph Potts, 
Coll Dean, R. H. Rogers, A. W. Von Schmidt and Geo. W. 
Dent. Woods, from A. W. Crawford. 
Dr. Blake read the following paper: 
