ITS The American Geologist. September, ;■ 
by the tributary water courses on each side, which open into 
the lake valleys high up their sides. Cayuga and Seneca, the 
largest two of the Finger lakes, are respectively 378 and 441 
feet above the sea level, and their beds sink to 57 and 177 feet 
below that level. 
Prof. W. H. Brewer spoke of his observations of that region 
during his boyhood and youth, which were spent a few miles 
west oi* Ithaca and the south end of Cayuga lake. He would 
like to have the granite and other crystalline boulders of the 
district compared with the areas of their parent ledges in 
( 'anada. 
Prof. H. S.Williams remarked that near Ithaca glacial striae 
are found on the side of vertical or overhanging rock cliffs. 
Soundings of Keuka lake show that the bed of its eastern 
branch has a descent of about 100 feet where it joins the 
western branch and main valley of the lake, indicating that 
the preglacial drainage there passed to the south. 
Prof. Chambeklin noted four east to west belts in the region 
comprising the Finger lakes, namely, first at the north, the 
belt of abundant and large drumlins between lake Ontario and 
these lakes: second, the Finger lake belt: third, the terminal 
moraine; and, last, the unglaciated area. Preglacial erosion 
had cut deep notches southward from the Finger lake valleys 
to the drainage basin of the Susquehanna river. This region 
presents a most interesting field for further study by glacial- 
ists. 
Additional facts bearing mi the <in<sti<>n of the Unity of tht 
Glacial period. By Prof. G. Frederick Wright. The val- 
leys of the upper Ohio and its tributaries, below their highest 
terraces, have been supposed by glacialists who accept two 
epochs of glaciation and a long interglacial epoch, to have 
beencutdown in the rock strata by stream erosion during in- 
terglacial time. The author, who regards the glaciation of 
the entire Ice age as continuous, thinks that these valleys 
were eroded during a preglacial time of high uplift of the 
land; that they were filled with valley drift to the levels of 
the highest terraces: that stream erosion during the closing 
stages of the glaciation removed this drift, excepting its scanty 
remnants as terraces, probably cutting as deep as to the pres- 
ent river beds; and that the later and lower terraces, contein- 
