Prof. Guyot's Measurements of the Alleghany System. 391 
XXXVI—Geographical Notices. No. XIV. 
Pror. Guyot’s MEASUREMENTS OF THE ALLEGHANY Sys- 
Grand Pierre. The weather has been propitious and he has ae- 
complished much work, having measured between one hundred 
and fifty and two hundred points in addition to those which were 
reviously determined. He has extended his investigations as 
har as Georgia, and has seen the extremity of the Blue Ridge 
. and the Unaka. It may now be affirmed with safety that the 
Southern portion of the Alleghanies is better known so far as 
pertains to its hypsometry, than any other portion of the system. 
here is reason to hope that at an early day Professor Guyot 
will lay before the readers of this Journal, in detail, the results 
of his important and prolonged investigations; meanwhile the 
reader will be interested in the following partial summary of his 
observations in North Carolina. 
ese measurements sufficiently indicate the grand traits of 
structure of that loftiest portion of the Appalachian system. It 
may be seen that the Roan and Grand Father mountains are the 
two great pillars on both sides of the Northgate to the oe 
mountain region of North Carolina, which extend between the 
two chains of the Blue Ridge on the east and the Iron and Smoky 
and Unaka mountains on the west. That gate is almost closed 
by the Big Yellow mountain. The group os od ease pean 
