Geographical Notices. “113 
the principal drainage is to the south, the intervening water-sheds 
between the different pelee presenting ridges of moderate eleva- 
tion, as exhibited in the general profile of the nigel: 
4 The region under special pesay ieee. n, comprises three very 
a distinct sections, which may be briefly referred iol in regular order, 
Ist. From io Grande to the Colotade of the Wes 
- 2d. From the Colorado to the summit of Tehachapa Pats i in the 
ity Ne 
; great ‘able dand or mesa : foncateak of Western New Mexico and 
“ Eastern Arizon na, comprising the sedimentary strata of Triassic and 
4 Cretaceous rocks, which spread out into broad uplands, abruptly 
terminated by steep mural declivities, bounding valleys of erosion, 
or presenting isolated butes and fantastically castellated | soakt, 
| __ that serve to give a peculiar aspect to ‘os scenery The prin 
. foci of extinct voleanic action are represented by the aieinae 
. cones of San Mateo, and San Francisco, attaining an elevation of 
over 12,000 feet above the sea, whose alpine slopes, reaching above 
the timber t line, present in their cov vering of snow, the only win- 
tery feature pertaining to this latitude. 
It is in the eastern section of this district that we meet with the 
_ nt Tt and flourishing of the aay ees tribes known as 
north, com i. a simi 
with fertile volleys ead ' y slopes, and deeply sheltered 
ee ecoally adapted to their mode of life as nomadic and at 
oy artially agricultural ; still, better suited, however, 
a of an energetic civilized community, ag can prop- 
the advantages of a healthful climate, combined 
—SEconpD SERIES, VOL. oy tn We ae 139.—Jan., 1869. 
: aes 
