Review of Recent Geological Literature. 189 
of the water of the Muskingum by the eastern edge of the Scioto lobe of 
the continental glacier caused that river to deserl what the author re- 
gards as its preglacial channel and to take a new one along its presenl 
course. Tlie deposit of huge moraines across the same preglacial chan- 
nel produced a lake covering the site of the present Licking reservoir, 
which was ultimately drained by the cutting down of its eastern bar- 
rier. The figures accompanying the paper will enable any glacialist to 
comprehend the author's reasoning, but only a visit to the spot can 
show its full force and significance. 
In the second part of the paper the author ranges over a much wider 
Held and attempts a reconstruction of the preglacial hydrography of 
Ohio which is both novel and striking, but which, in spite of some 
Strong points, geologists will be slow to adopt, at least in full and with- 
out modification. He traces the preglacial Muskingum from its present 
channel at Dresden southwest ward to Newark along a wide abandoned 
vallfey and then through Fairfield county into the Scioto basin. Thence 
he carries it to the west and northwest through Madison and Cham- 
paign counties into the Wabash drainage system in Indiana. This view 
certainly affords an explanation which no other has done of the ver\ 
deep drift-filling along the line in question, and especially of the im- 
mense mass of drift at St. Paris, where it is more than 500 feet thick. 
Bui it compels the blotting out of the Ohio as a continuous channel, and 
renders necessary the adoption of the view that the present valley of 
that name is made up of parts of several preglacial valleys united by 
glacial and postglacial cross-cuts. This will scarcely commend itself to 
glacial geologists without very strong evidence. The task is too vast 
for* postglacial time. Possibly some modification, however, ma\ remove 
the difficulty and allow t he abandonment of the Wabash channel at a 
earlier date and the establishment of an Ohio before the Glacial period 
began. We should like to suggest to the author a consideration of some 
of the possibilities along this line. Change of level in the peneplain 
during Tertiary time may have been sufficient to produce such an effect, 
and of this some amount of evidence is already attainable. 
Professor Tight quotes the fad that the valleys of the present Mus- 
kingum, the Scioto, ami other st reams of the same region, narrow to the 
southward, in support of his opinion that their flow has been reversed. 
The argumenl is good, but would apply as well to thai above suggested. 
K. W. C. 
On tin iirriiri-i lu-i of a lunji iirm of Nephelim SyeniU in tin township of 
Dungannon, Ontario. By Frank D. Adams. (Amerj .lour. Sci., '■'•. vol. 
xi.viii, pp. 10-16, J ul y, 1894.) The area described is in Bastings county, 
in the midst of Laurentian rocks, and this is the first discovery of neph- 
eline syenite in the Laurentian system of Canada. The essential con ; 
stituents of this rock are nepheline, which often makes up almost the 
entire rock, albite, and some little brown mica and hornblende. Ortho- 
<dase. which is common in rocks of i his class, is not found as an original 
mineral. A noticeable feature of the rock is 'he occurrence of sc a polite 
and calcile. both rather common and having the appearance of original 
