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but the showers are only experienced occasionally; a few 
leagues higher up, they fall constantly during the mountain 
winter. No vegetation yet appeared on the hills, except 
Cacti, chiefly C. tetragonus, which became more common as 
we proceeded. There were Huarango trees and Willows in 
the valley, rows of the latter being frequently planted along 
the water-courses. I had not hitherto had an opportunity of 
collecting a single plant, though, doubtless, many might be 
‘found in the low ground; but, in order not to encroach on 
the cultivable land, the roads are generally carried along the 
sides of the hills where that is practicable, although the route 
becomes more circuitous, and more fatiguing for the mules. 
A little higher up, the Molle (Schinus molle) began to make 
its appearance, loaded with its bright red berries. 
At the end of two leagues, we came to Santa Rosa de 
Quive, a small place consisting now only of a few huts on 
the hillside; a church and some houses in the valley 
having been destroyed by fire during the revolution, Here 
we halted for the night. "The little hut where we stopped, 
was not large enough to contain one-third of our party; 
but being on an eminence far above the valley, there was no 
danger in sleeping out of doors, and we therefore took up 
our quarters in an open shed. ; 
. June 23d.— Having been fortunate in escaping the attacks 
of mosquitoes, which are numerous in the valley, we rose at 
daybreak, and started as soon as our numerous beasts could 
be laden and saddled. OS EDO IET PET 
. The rock here is granite, which is again succeeded by 
greenstone. After leaving Santa Rosa, we observed little 
difference in the appearance of the hills, which were still 
covered with Cacti till we approached Yazo, a small village 
three leagues farther up. Though seated on a natural plat- 
form, far above the valley, the inhabitants of Yazo are very 
Subject to intermittent fever, and the place has a bad name, 
9n that account, among those who travel to Pasco; but 
there can be no doubt that the people bring the germ of 
the disease from below. They work all day in small pieces 
of irrigated land in the narrow valley, where the heat is 
