SoS ahs eh ge ARE a ay Ceca ge aL! oN, es ea a ee ee len ee ae Ses ey ng eee 
A. Guyot on the Appalachian Mountain System. 165 
friends who have attended me in the various excursions, an 
who have studied under my direction the use of the barometer. 
I ought particularly to mention Mr. Ernest Sandoz, who has been 
with me in nearly all _ excursions, and Mr. Emile Grand 
ome for the measurement of Mt. Washington in 185 1, 
be made “2 two of his assistants, Messrs. Edward Goodfellow 
and B. F. Wes 
I would a mention Dr. Algernon Coolidge, who oe 
nied me to the Green Mountains, and to whom I ow addi- 
tion to sorteapessitiris observations, the ehoesaseribely ‘of the 
Camel Hump. My young friends, Alexander Agassiz, Edward 
Rutledge, and Herbert Torrey, have given me active codperation 
in the White Mountains. To my friend and fellow traveller in 
the Black Mountains, Rev. W. H. Green, of Princeton, I owe a 
number of corresponding a observations, and likewise 
a number to Prof. W. C. Kerr, of Davidson College, and to Mr. 
. A. Benners, of Waynesvi ile. 
The corresponding observations, made by my companions in 
travel, were taken hour by hour, and sometimes even once every 
quarter of an hour, so as to slink the construction of a complete 
barometric curve which represents with great exactness the state 
of the barometer for any hour of the day, and renders the error 
of interpolation almost nu 
For the purpose of distinguishing accurately the relative posi- 
tion of the regions explored, it may be well to descri e gen- 
eral structure of the system of mountains to which they belong, 
he upheavals of ancient rocks which constitute this well con- 
nected physical structure, for which, as a whole, it is proper to 
Tetain the common name of the a system, extend in 
an undulating line thirteen hundred miles in a mean direction of 
N.E. to S.W., from the promontory of Gaspé upon the Gulf of 
t. Lawrence to Alabama, where the terminal chains sink down 
and are lost in the recent and almost horizontal strata of the 
cretaceous and tertiary pe gm which cover the oa por- 
tion of the surface of this state. This long range of elevations 
is composed of a souptelaoable number of chains, sensibly par: le L 
to each other, occupying more particularly the eastern part which 
faces 4 “i a ocean, and of an extended too whi 
wards the west and map and nes s y 
ae Exe end Or- 
The | base on which this large belt of mountains rests, and 
_ which may be considered as bounded by the Atlantic Ocean on 
; ee and aria the Ohio and St. Lawrence rivers on the other, 
» Srrius, Vou. ——* Maxc, 1861, 
