"No, but look! A rock closes the ravine."
"Then what shall we do?"
"It is impossible to slip beside it for it is too close there; so it will be necessary that we turn back a little, get on top, and ride around the obstruction; but it is yet two hours to night; therefore we have plenty of time. Let us rest the horses a little. Do you hear the waterfall?"
"I do."
"We will stop near it for the night."
After which he turned to Kali, ordered him to climb to the brink of the ridge and see whether, beyond, the ravine was not filled with similar obstructions; he himself began to examine the rock carefully, and after a while he exclaimed:
"It broke off and tumbled down not long ago. Nell, do you see that fragment? Look how fresh it is. There is no moss on it, nor vegetation. I already understand, I understand!"
And with his hand he pointed at a baobab tree growing on the brink of the ravine whose huge roots hung over the wall and were parallel with the fragment.
"That root grew in a crevice between the wall and the rock, and growing stronger, it finally split the rock. That is a singular matter for stone is harder than wood; I know, however, that in mountains this often happens. After that anything can shake such a stone which barely keeps its place, and the stone falls off."
"But what could shake it?"
"It is hard to say. Maybe some former storm, perhaps yesterday's."
At this moment Saba, who previously had remained behind the caravan, came running up; he suddenly stood still as if pulled from behind by the tail, scented; afterwards squeezed into the narrow passage between the wall
