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103 Re [7] 
_ the same spur noted on the 22d asrunning southeast and northwest. 
It'is chiefly covered with floating sand, the surface of which in 
various places, is white with diminutive spinelas, and every where 
over the whole surface is found the large and soft muscle shell. 
have noted the only two patches of grass found during the 
““jornada.”” There were scattered, at wide intervals, the palafoxia 
linearis, atriplex, encelia farinosa, daleas, euphorbias, and a simsia, 
described by Dr. Torrey as a new species without rays. 
The southern termination of this desert is bounded by the Tecaté 
chain of mountains and the Colorado; but its northern and eastern: 
boundaries are undefined, and I should suppose from the accounts 
of trappers, and others, who have attempted the passage from Cali- 
fornia to the Gila by a more northern route, that it extends many 
days’ travel beyond the chain of barren mountains which bound — 
the horizon in that direction. r ys 
mica and seams of gypsum. Nothing could be aad and 
desolate in appearance. The gypsum had given some co 
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