jhe 
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leave the valley scarcely a mile wide. . The cottonwood, however, 
is getting more plentiful, and we have not been obliged to use the 
“bors de vache” in cooking for some days. a 
To-night I measured two sets, or 18 lunar distances, east and west. 
d, 12 altitudes of polaris, 10 of andromede, and 8 of alpha lyre, 
. ST he resulting latitude 34° 07’ 39". ; 
‘Longitude 7h. OTm. 54s. " 
October 5.—Camp near Secoro.—Last night a Mexican came into 
camp, and said we should now leave the river and strike for the 
Gila, a a west. He was one of the men engaged by meas 
guide while o 
confused mass of volcanic rocks, traversed by walls of a reddish 
colored basalt and seams of porphyritic lava and metamorphic sand 
Stone. In one or two places, where the water had washed away the 
ut in some places 
: 
turbance. With th 
habitants, is prettily situated in the valley of the river which is 
_,ete almost circular, and about ‘three or five miles in diameter. 
€ church, as usual, forms the salient point, which meets the eye 
ata great distance. 
ie The growth on the sand plains to-day was chiefly iodeodonda* 
® writing the above, the following extract of a note from Dr. Torrey was received — 
-# Sine t 
x in reference to this plant, which is so remarkab e, and extends over so great a surface. 
OU rares @’Amerique.’. It is described by him as a new genus, under the name larrea. . Tt is 
Well figured in his 48th plate as.Larrea Mexicana. In its affinities it is allied to gulacum.” 
bie a - t * so 
oA Bl : ' de 
Fy eek 
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