A CURIOUS MIRAGE. 61 
road Pass. Our route was a perfectly straight one; direction, 
10° south of west, across the flat Valle de Sauz; the distance 
from pass to pass being forty-six miles, odometer measure- 
ment. No water was to be found on the way, but we had no 
difficulty in making the distance in two days with one dry 
camp. As for the Rio de Sauz, I have been unable to find 
it anywhere but on the map, although I have crossed the 
valley five times in different places. A river ought to flow 
through a valley thirty miles wide and 120 long, but with 
the exception of an occasional dry water-course of most insig- 
nificant dimensions, trending in a north-west direction towards 
the Rio Gila, I could discover no evidence of one. Even when 
we had reached Railroad Pass we did not find water with- 
out considerable difficulty, so that instead of camping in the 
P ass itself, we were obliged to follow a dry water-course for 
six niiles, until we reached a spring issuing from the side of 
| the lofty Dos Cabezas (two heads). 
Our guide, Juan Arrolles, while following up this arroyo, 
was fired at by some Apaches from the summit of a hill 
overlooking the spring. Although we galloped up imme- 
H diately on hearing the shots, we could not find a trace of the 
savages. 
I must not forget to mention a very curious mirage which 
My r. Eicholtz and myself observed early in the morning, as. 
‘We were approaching Railroad Pass. We were watching the 
gap in the mountains, for which we were making, when we 
observed between it and us a perpendicular cliff, in which 
the horizontal strata of the rocks were most distinctly visible. 
‘We were greatly disappointed; Mr. Eicholtz was almost 
alarmed; for if this was Railroad Pass, the easy slopes of 
whose sides had been so much extolled, there must be some 
is-statement. Looking round, however, we noticed that 
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