iSgS-] 505 [Annual Meeting. 
mined by the presence of an underlying; ledge. On the surface 
of each are numerous angular boulders, and one or two surfaces 
much like the rounded surfaces of an underlying ledge with 
pressure-planes extending in the general direction of pressure- 
planes found in ledges to the west. Between these two projec- 
tions are a few i-ounded faces, apparentlj^ of a north and south 
cliff extending along the side of- the hill close to the road. 
In the swamp farther south is a somewhat large outcrop ; and 
eastward nearer Dover, another place which, like those extending 
eastward from Pegan Hill, presents evidence of an underlying 
ledge. 
Half a mile southeast of Dover other outcrops appear extend- 
ing northeast toward another outcrop of granite half way to 
Charles River Village. 
In the broad valley thus marked out, no outcrop is to be found 
as far as the igneous outcrop half a mile southeast of Sabrina 
Lake. 
If, then, in locating the dividing line, we follow the principle 
previously noted, that where the dividing line is observed it lies 
near the granite highlands surrounding the Basin rather than in 
the Basin itself, we must here draw that line along the base of 
Pegan Hill to the west, thence in a wide curve south of Dover 
station toward Charles River Village. It is not intended to 
consider whether the line from this latter point should turn 
eastward or northward, since in both those directions the regioti 
lies beyond the area under consideration. 
AxxuAL Meetixg, May 1, 1895. 
President W. N". Niles in the chair. Forty-four persons 
present. 
The following reports were presented : — 
Report of the Curator, Alpheus Hyatt. 
Last year special attention was called to the scientific investi- 
gations of Professor Crosby in the department of geology, and to 
the need of keeping up and providing for such a class of work. 
