JANUARY 25, 1901.] 
not so connected, but a definite conclusion 
cannot be reached until a more extended 
study is made of the rest of the range. 
In discussion, F. D. Adams commented 
on the interest attaching to this moun- 
tain both in its petrographic and strati- 
graphic relations. Mention was made by 
others of the benches of boulders which 
lie on the side of Rigaud. It was brought 
out that they are coarse cobbles, entirely 
unglaciated and all of local origin. They 
are known as the Devil’s Garden and are 
at least thirty feet deep, but have no fine 
material between them. N.S. Shaler, there- 
fore, remarked that they could not be beach- 
deposits, else they would be packed with 
sand. The interpretation of the boulders 
is an interesting point in post-glacial geol- 
ogy, but it still remains to be solved. J. 
F. Kemp remarked the similarity of the 
syenite to that of the Adirondacks, espe- 
cially as described by H. P. Cushing in an 
earlier paper. 
At the conclusion of Mr. Leroy’s paper 
the session adjourned. 
In the evening the Society was most 
hospitably entertained by Dr. and Mrs. F. 
J. H. Merrill and had the opportunity of 
meeting many Albany people. 
On reconvening on Saturday morning the 
most important executive business was the 
adoption of a resolution recommended by 
the Council, which read as follows : 
Resolved, That recognizing the great, his- 
torical, scientific and economic value of the 
collections of the State Museum in Albany, 
representing the geology and paleontology 
of the State of New York, the Geological 
Society of America expresses the earnest 
hope that an ample and fireproof building 
may be provided for the display of the 
priceless collections, where they may be ac- 
cessible to students interested in the prog- 
ress of science and the economic develop- 
ment of the State. 
The Society then listened to the Presi- 
SCIENCE. 137 
dential address of Dr. George M. Dawson, 
who took for his subject ‘The Geological 
Record of the Rocky Mountain Region.’ 
The paper was illustrated by maps and by 
comparative stratigraphic sections both east 
and west of the Canadian Rockies. It dealt 
especially with Canada and will be probably 
printed in full in a later number of SctENcE. 
The following paper was read in abstract 
by G. P. Merrill. 
Weathering of the Granitic Rocks of Georgia : 
Tuomas L. Watson, Atlanta, Ga. 
The paper embraces the results of a de- 
tailed field and laboratory study of the prin- 
cipal exposures of the granitic rocks in Geor- 
gia. On structural and textural grounds, 
the rocks were divided into and discussed 
under (a) the true granites with even-grain 
texture ; (0) porphyritic granites; and (c) 
granite-gneisses. Hach type, as here dis- 
tinguished, is represented by a number of 
localities in somewhat widely separated 
parts of the State. In mineral and chem- 
ical composition, the rocks are closely sim- 
ilar, and all carry biotite as the chief 
accessory. 
The physical conditions of the fresh rock 
and of its accompanying, decayed product 
as studied in the field were carefully stated, 
and each was described petrographically, 
the description being followed by a discus- 
sion, based on chemical analyses, of the 
changes incident upon weathering. 
In taking up the changes manifested in 
the weathering of the rocks, as shown in 
the analyses, calculated amounts of each 
constitutent lost and saved were separately 
made on three assumptions, namely, that the 
Fe,O,, the Al,O, and the Fe,O,+ Al,O, have 
undergone noloss. The results were then 
compared. With the exception of the total 
loss for the entire rock, the results proved to 
be closely similar for the three assumptions. 
The Peneplain of Brittany: W. M. Davis, 
Cambridge, Mass. 
