On the other hand, they could see, across the broad basin of the San Luis Valley, other ranges of unknown mountains, whose mysteries they were yet to explore. Through this western valley, flowing southward, wound the shining ribbon of the Rio Grande. Both north and south of them were mountain-peaks. To climb to the very summit of one of these was Glen's present ambition, and his longing eyes were turned more often to the snow-capped dome that rose in solemn majesty on the south side of the pass than in any other direction. He even succeeded in persuading Binney Gibbs that to climb that mountain would be just a little better fun than anything else that could be suggested. Still, he did not see any prospect of their being allowed to make the attempt, and so tried not to think of it.