452 A SUSPICIOUS-LOOKING HEEMIT. Book III. 
to the geologist. From the Sabinal, eruptions of trap 
are seen on the road. Here, on the Rio Frio, a distinctly 
separated eruptive mass branches out like veins into the 
adjacent stratified rock. This latter has undergone a 
change from contact with the trap, and appears as a cel- 
lular weather-worn, frequently green, breccia-like mass. 
The trap, on the contrary, is in parts blue, with fibrous fila- 
ments, like Arragonite, Coelestine, or Serpentine Asbestos, 
running through it like a net. At Fort Inge, another eruptive 
mass is visible in the limestone, forming a conical hill of a 
grey kind of porphyritic trap with feldspar and augit ; and 
similar eruptions of trap are seen between Elm Creek and 
Fort Clark. 
In climbing about the trap rock on the Rio Frio, I 
seemed to have struck upon a kind of path, which I con- 
jectured to be the track of a bear ; I followed it with eager 
attention, till it led me to the edge of a perpendicular 
precipice. At the base, the wall receded so much that 
it was not visible, and appeared, from the place on which 
I was standing, overhung with the rock ; over which, during 
rains, the water rushes down. To the right and left of 
this spot the rock rises from the deep water of the river, 
while here a small flat beach lies between it and the 
wall. The locality, as may be imagined, is almost inac- 
cessible, being approachable only by swimming across 
the river, or climbing down the wall. Great was my 
surprise, therefore, when I perceived that this isolated spot 
was inhabited by a man. A path led from the overhang- 
ing rock to the water, on the banks of which lay some 
poles, which appeared to belong to some fisherman. 
Among the bushes I discerned the leafy roof of a hut, and 
once I fancied that I heard below a human voice. I re- 
called to mind the hut of the runaway negroes on Devil's 
