Note 358 — Chapter III · COLUMBIANS. (continued 2)
Reading edition
Have no idea of drawing maps on the sand. 'Their powers of computation ... are very limited.' Emmons, in Schoolcraft's Arch., vol. iii., pp. 205, 207; Lewis and Clarke's Trav., p. 493; Ross' Adven., pp. 88-9, 98; Kane's Wand., p. 185.