Maybe he would have to go over on the other side of that biggest hill before he came to the place where they grew.

He rode unafraid down a steep, rocky slope where Silver picked his way very, very carefully, and sometimes stopped and smelt of a ledge or a pile of rocks, and then turned and found some other way down.
The Kid let him choose his path--Daddy Chip had taught him to leave the reins loose and let Silver cross ditches and rough places where he wanted to cross.

So Silver brought him safely down that hill where even the Happy Family would have hesitated to ride unless the need was urgent.
He could not go right up over the next hill--there was a rock ledge that was higher than his head when he sat on Silver.

He went down a narrow gulch--ah, an awfully narrow gulch! Sometimes he was afraid Silver was too fat to squeeze through; but Silver always did squeeze through somehow.

And still there were no brakes growing anywhere.