(14) Wilcox Head (Cape Holm) is a mass of reddish feldspathic Gneiss with many streaks of black hornblende Gneiss in it. Devils Thumb is a columnar basaltic mass like the Mato Jefe capping an island whose sides slope down at 25°-35° from the base of the tower. As we approached and passed lost it behind Wilcox Head, it seem- ed to me that I saw more than half way around it, but even so I could not make out the snow covered ridge that backs it according to the Arc- tic Pilot, confirmed by Lange Rock, who went to it this spring in his way back to North Star Bay.