I merely speak of the lizard to convince you that a man's features would show very distinctly in the telescope.

And please observe, Casey Ryan, that I am very serious at the moment.

This may be important to you, remember.
"I was sitting among a heap of boulders that capped the ridge, and it happened that I was pretty well concealed from view because I was keeping in the shade of a huge rock and had crouched down so that I could steady the telescope across a flat rock in front of me.

So I was not discovered by a man down in the canyon whom I picked up with the telescope while I was searching the canyon side for a spring.
"The man was suddenly revealed to me as he parted the branches of a large greasewood and peered out.

I think it was the stealthiness of his manner that impressed me most.