But there was a way, and he saw it in due season. Only a very expert dreamer could have used those imperceptible footholds, yet to Carter they were sufficient. Surmounting now the outward-hanging rock, he found the slope above much easier than that below, since a great glacier's melting had left a generous space with loam and ledges. To the left a precipice dropped straight from unknown heights to unknown depths, with a cave's dark mouth just out of reach above him. Elsewhere, however, the mountain slanted back strongly, and even gave him space to lean and rest.