158 Scientific Intelligence. 
The object of the meeting is to perfect a scheme embodying 
the thoughts of American geologists on the questions of classi- 
fication, nomenclature, coloration, etce., entering into the system of 
unification of geological science which is the object of the Inter- 
national Congress. In order that the Committee may represent 
the views of all American geologists it invites from all their 
individual opinions on any subjects likely to arise in the Congress. 
Those who will meet the American Committee in Albany, are 
requested to send to the undersigned a note of the topic or topics 
they propose to treat, and the time which they will require. In 
cases where it is not convenient for them to go to Albany, they 
are requested to forward a statement of their views in writing to 
the undersigned before April 1, for presentation to the Committee. 
For information as to the kinds of questions to be discussed, atten- 
tion is called to the report of the American Committee published 
last Spring, in which the debates of the 3d sexsion of the Inter- 
national Congress are reported. The following are the sub-com- 
mittees of the American Committee: 
Archean, Hunt, Hitcheock, Winchell; Zower Paleozoic, Hall, 
Winchell, Lesley; Upper Paleozoic, Hall, Lesley, Newberry, 
Stevenson, Williams; JM/esozoic, Newberry, Cook, Cope,» Powell ; 
Cenozoic (Marine,) Smith, Newberry ; Ceenozoic (Interior), Cope ; 
Quaternary, Recent Archeology, Powell, Winchell, Cook. 
Prrsiror FRAzErR, Secretary. 
5. The “ Mountain limestone” in Pennsylvania a little over 
1100 feet below the Pittsburg Coal.—The Pennsylvania Geological 
Report for the year 1885, contains, on pages 222 to 226, a brief 
report, by Professor A. Linn and E. kinton, on the discovery of 
the Mountain limestone in connection with the Washington 
County gas well. The limestone is nearly pure for 120 feet or so, 
and has below it 60 feet of arenaceous limestone. The latter con- 
tains quartz sand, and even pebbles in places, with some grains 
of feldspar. This bed is regarded as the equivalent of that de- 
scribed by Professor Lesley and Dr. Stevenson as occurring in the 
gaps of Laurel Hill and Chestnut Ridge. } 
6. Hossil Trunk of a tree in hydromica or sericitie gneiss.— 
Dr. E. de Fellenburg announced to the Helvetic Society of 
Natural Sciences in Geneva, Aug. 1886, the discovery of a fossil 
trunk of a tree in the gneiss of the valley of Oberhasle (Haslithal) 
—the length 1:45 meter, and breadth 0°12 to 0°17. It is not quite 
cylindrical, and has a series of annular furrows, in several places 
a brown coating, with fine longitudinal striations and what ap- 
pears to be a series of joints. Another smaller specimen accompa- 
nied this; some characters suggested that it was a Calamites, but 
no decisive opinion is expressed. Professor Baltzer stated further 
that the sericitic gneiss is associated with phyllite, and also with 
bands of granite; and he expressed his confidence that the speci- 
men was a true fossil, and the gneiss a *paleozoic gneiss.—Arch. 
Sci. Phys. et Nat. Geneva, Sept.—Oct., 1886. 
7. Second Contribution to the Studies of the Cambrian 
