398 3 Recent Literate, 
Its chemical constitution may differ, but the difference of anima 
species is mainly morphological, and there is no reason why dt 
ferent protoplasm may not occur in similar species, while species 
differing widely morphologically may be formed of similar 
protoplasm.— W. N, L. 
WHITE’S GEOLOGY OF THE SUSQUEHANNA RIVER REGION 
While such a report as this is necessarily filled with details, Pro- 
fessor White has elicited some results (epitomized in the prefato 
letter of Professor Lesley) especially bearing on paleontology 
and glacial geology, which are of general interest. Professor 
White finds fossiliferous beds high in the Catskill formation, 
some of the fossils of which appear to be of Chemung type. The 
discussion of this point is a most interesting one. 
The geology of the great terminal moraine, the general cours 
of which is outlined in the prefatory letter of the director of Ù 
survey, is discussed. As the ice-sheet, he says, CoV 
whole country, the high mountain plateaus and the low valleys 
alike, the moraine is in some places 2000 feet above ocean 1 
as in the North mountain ; in others only 500 feet, as at a 
Professor White’s observations on the floods of pip | 
the formation of the terrace-plain of part of Columbia 
are of much interest. : mo 
The limits of the glacial drift in the counties Bhs dd 
carefully given. “Glacial drift, as a sheet of unstra he oe 
gravel and boulders, covers the whole region back of esos 
raine, and is finally exposed along water-courses. from the 
of this unis rsal mantle of ice-borne trash, br out ae d 
north, is aby ıt fifty feet; but where it is banked into cee 
hollows of the country, filling up ancient river valleys, | hae 
* ok * in other aren 
ickness fer 
orainê. #5 
ret 
fiy tE 
average be finally accepted, it must set at s: a pSr 
and plains of Pennsylvania and New York, the 
basins and the plain of Canada. Were the ave 
the drift twice fifty feet, it would be egia tuo 
power of the ice-sheet has been immensely ° 
ogress Ci A 
1 Second Geological Survey of Pennsylvania; Report gE bb akso” js 
of the Susquehanna River region in the six counties d. Č. WHITE. bar 
serne, Columbia, Montour and Northumberland. By ee in the text. 
geological map in two sheets, and thirty-one page plates ae 
1883. 8vo, pp. 464. 
