238 'Die American Geologist. April, \wi 
former baselevel, MAI; and the indication of "recent uplift" 
being no less apparent in the narrow gorges, U, incised in the 
floor of the maturely opened valleys, ABC, with reference to 
the nevv baselevel, NN. The essential evidence of such 
recent uplift and rejuvenation is found in benches E, F, on 
the compound valley slopes, AED and CFD. If rejuvena- 
tion were so long ago that this bench were destroyed by the 
development of continuous slopes, AGD and CHD, then 
the uplift could not be discovered by topographic evidence. 
It is on evidence of this kind that rejuvenation has been an- 
nounced for the Susquehanna district" of the Pennsylvania Ap- 
palachians, and for the Hudson valley; but no description has 
been published of any 'such evidence for the rejuvenation of 
New England. The deep valleys of many rivers in Massa- 
chusetts and Connecticut have no persistent benches on their 
slopes, and there is no visible reason for saying that any im- 
portant pause was made in the elevation by which the former 
baselevel of the uplands, AC, was replaced by the present 
baselevel. NN. of the valle}'s, AGDHC. The rivers 
trulv have many falls and rapids, due to their displacement 
from better graded courses by the irregular distribution of 
glacial drift, but this is quite another matter. 
The valley-side benches are important items in the present 
discussion, if they exist at all; for when fully established they 
will define many interesting points. If high on the valley 
sides, as at A. fig. 6, (resembling the gorge of the Rhine) they 
would show that the previous cycle had gone far beyond ma- 
turity and well into old age before uplift occurred; if low 
down in the valley bottom, as at B (resembling the Frazer river 
valley in British Columbia), they are of trifling importance, 
as far as the present discussion is concerned. If the down- 
stream slope of the benches were about parallel to the present 
profile of the rivers, a uniform uplift would be suggested; if 
distinctly not parallel to the present stream profiles, an un- 
even uplift would l)e implied. All these points should receive 
specific attention if the new hypothesis, which "requires no 
long periods of relative quiet," is to be accepted. As now 
stated, the recent rejuvenation of New England seems to me 
very open to question. There is no evidence of recent re- 
juvenation in the occurrence of a young coastal plain along 
