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421 
[Hartwell. 
April 20, 1892. 
President G. L. Goodale in the chair. One hundred and 
twenty-one persons present. 
Mr. W. A. Jeffries, for the Committee on the nomination of 
officers for 1892-93 presented a report. 
The President announced the award by the Council of the 
Walker Grand Honorary Prize to Prof. James Dwight Dana of 
New Haven for distinguished services in natural history. The 
amount awarded was one thousand dollars. 
The election of Miss Ida S. Hainmerle, Messrs. F. S. Hollis 
and J. G. Jack, and Miss Jennie M. Jackson as Corporate Mem- 
bers was announced. 
The following papers were read by title : — 
Fusion of hands, by Thomas Dwight ; An embryological bibliog- 
raphy, by Charles S. Minot. 
Dr. John Murray of Edinburgh gave an account of some of his 
recent investigations into the physical and biological conditions of 
the lochs and fiords of the west of Scotland. 
Mr. G. II. Barton sketched the distribution of drumlins in 
Massachusetts. The number already mapped exceeds 1,100. 
The following paper was read : — 
THE PEARL HILL POT-HOLE. 
BY E. ADAMS HARTWELL. 
A continuous ledge of mica schist may be traced through the 
easterly part of Fitchburg, Mass. It is broken in three places by 
as many water courses : the Nashua River at the southern portion, 
Falulah Brook about midway, and Lord’s Brook at the northern 
extremity. Beginning at the south, its various elevations are 
known as Mt. Elam, Hale Hill, Mt. Vernon, Pearl Hill, and Rat- 
tlesnake Ledges ; the greater portion of the latter, however, are 
in Ashby. 
The strike is not far from the true geographical meridian, and 
the dip does not vary much from 45° to the west, except near 
Rollstone from Hale Hill, where the dip of the strata gradually in- 
creases, until it is nearly, if not quite, vertical, rendered so by the 
ejection of Rollstone granite between the strata. 
