1872.] 3 [Brewer, 
Dr. Chas. T. Jackson said that he could not admit these 
pebbles were ever -plastic, and attributed their form to the 
action of water. 
Mr. A. H. Tuttle described a shelter cave once used by the 
Indians at Illyria, Ohio. 
It is at the junction of the Black and Monongahela Rivers, and has 
been disclosed by changes in the form of one of these rivers. Within, 
the soil to a depth of nearly three feet, is composed of ashes, bones, 
shells, ete., with fragments of pottery, axes and arrow-heads. Some 
human skeletons were said to have been found, in a position indicating 
that they had been crushed by the fall of fragments of the overhang- 
ing rocks. 
The following communication from Dr. T. M. Brewer was 
read : — 
The announcement was recently made that the committee on birds 
had obtained, by exchange, with Mr. H. W. Henshaw specimens of the 
Oporornis agilis, or Connecticut Warbler, in the immature. and in the 
mature plumage, both male and female. As this has been regarded as a 
very rare species, and was almost unknown to the older ornithologists, 
the fact that these birds have twice made their appearance in Massa- 
chusetts for brief periods, in comparatively large numbers, is one of 
marked interest, and worthy of mention. 
These birds were first observed in the autumn of 1870. In the 
early part of September, among the marshes of Fresh Pond, Cam- 
bridge, they were quite numerous, and a number of specimens were 
procured, both by Mr. Henshaw and by Mr. Wm. Brewster, upwards 
of fifty in all. During September and October, 1871, these birds were 
azain observed in the same l»calities, and apparently in even greater 
numbers. ‘They were first noticed as early as Sept. 7th. From that 
time to the 27th, they were very common throuzhout the swamps of 
Fresh Pond; nine were seen after October 5th. 
Wilson and Audubon speak of these birds as very lively, and hence 
their specific name of agilis. This appears to be a misnomer. Mr. 
Henshaw states that they appeared to be terrestial in-habit, seeking 
their food on the ground. When startled they fly to the nearest bush 
