Gray lizards, those heirs of ruin, of sepulchres and desolation, glided in and out among the rocks or lay still and sunned themselves. Where prosperity has reigned, and fallen; where glory has flamed, and gone out; where beauty has dwelt, and passed away; where gladness was, and sorrow is; where the pomp of life has been, and silence and death brood in its high places, there this reptile makes his home, and mocks at human vanity. His coat is the color of ashes: and ashes are the symbol of hopes that have perished, of aspirations that came to nought, of loves that are buried. If he could speak, he would say, Build temples: I will lord it in their ruins; build palaces: I will inhabit them; erect empires: I will inherit them; bury your beautiful: I will watch the worms at their work; and you, who stand here and moralize over me: I will crawl over your corpse at the last.

A few ants were in this desert place, but merely to spend the summer. They brought their provisions from Ain Mellahah—eleven miles.

Jack is not very well to-day, it is easy to see; but boy as he is, he is too much of a man to speak of it. He exposed himself to the sun too much yesterday, but since it came of his earnest desire to learn, and to make this journey as useful as the opportunities will allow, no one seeks to discourage him by fault-finding. We missed him an hour from the camp, and then found him some distance away, by the edge of a brook, and with no umbrella to protect him from the fierce sun. If he had been used to going without his umbrella, it would have been well enough, of course; but he was not. He was just in the act of throwing a clod at a mud-turtle which was sunning itself on a small log in the brook. We said:
“Don’t do that, Jack. What do you want to harm him for? What has he done?”
“Well, then, I won’t kill him, but I ought to, because he is a fraud.”
We asked him why, but he said it was no matter. We asked him why, once or twice, as we walked back to the camp but he still said it was no matter. But late at night, when he was sitting in a thoughtful mood on the bed, we asked him again and he said:

“Well, it don’t matter; I don’t mind it now, but I did not like it today, you know, because I don’t tell any thing that isn’t so, and I don’t think the Colonel ought to, either. But he did; he told us at prayers in the Pilgrims’ tent, last night, and he seemed as if he was reading it out of the Bible, too, about this country flowing with milk and honey, and about the voice of the turtle being heard in the land. I thought that was drawing it a little strong, about the turtles, any how, but I asked Mr. Church if it was so, and he said it was, and what Mr. Church tells me, I believe. But I sat there and watched that turtle nearly an hour today, and I almost burned up in the sun; but I never heard him sing. I believe I sweated a double handful of sweat—-I know I did—because it got in my eyes, and it was running down over my nose all the time; and you know my pants are tighter than any body else’s—Paris foolishness—and the buckskin seat of them got wet with sweat, and then got dry again and began to draw up and pinch and tear loose—it was awful—but I never heard him sing. Finally I said, This is a fraud—that is what it is, it is a fraud—and if I had had any sense I might have known a cursed mud-turtle couldn’t sing. And then I said, I don’t wish to be hard on this fellow, and I will just give him ten minutes to commence; ten minutes—and then if he don’t, down goes his building. But he didn’t commence, you know. I had staid there all that time, thinking may be he might, pretty soon, because he kept on raising his head up and letting it down, and drawing the skin over his eyes for a minute and then opening them out again, as if he was trying to study up something to sing, but just as the ten minutes were up and I was all beat out and blistered, he laid his blamed head down on a knot and went fast asleep."

“It was a little hard, after you had waited so long.”
“I should think so. I said, Well, if you won’t sing, you shan’t sleep, any way; and if you fellows had let me alone I would have made him shin out of Galilee quicker than any turtle ever did yet. But it isn’t any matter now—let it go. The skin is all off the back of my neck.”

Clemens initially formed a poor impression of Jack Van Nostrand (John A. Van Nostrand  (1847-79)) but later grew to like the “good-hearted and always well-meaning” youngster.  22 May 1908: note for 234.41–235.6," in Autobiography of Mark Twain, Volume 3. 2015

Two years after the completion of the excursion poor Jack was smitten with consumption, and his parents sent him to Colorado in the hope that a life in the open air there might save him—a hope which was disappointed. Meantime “The Innocents Abroad” had been published and distributed about the country. Jack rode two or three hundred miles, horseback, through the cattle ranches of Colorado all alone, and at the end of his trip he wrote back to Dan Slote and said substantially this:

“Tell Clemens I saw no human beings on that long trip but cattle ranchmen, and I fed and slept nowhere but in their mud cabins. Tell him that from the beginning to the end I saw only two books: one was a Bible, the other was ‘The Innocents Abroad.’ The Bible was in good condition.”

22 May 1908: Paragraph 7," in Autobiography of Mark Twain, Volume 3. 2015

Jack wrote to Sam from Manitou, Colorado June 29th 1875.  There does not seem to be an answer from Sam.