1. China, vol. i. p.162.
2. Letter on the provinces of Chili, Shansi, Shensi, etc., Shanghai , 1872, p. 13–18
3. Verhandlungen der K. K. geologischen Reichsanstalt, 1878, pp. 289 to 296. I could not avoid reverting to it repeatedly in China, vol. ii. (see lor descriptions f. i. pp. 349–351, 422–427, 530–533, 650–551, and for discussion, pp. 741 to 766).
4. Letter on the provinces of Honan and Shausi, Shanghai , 1870, pp. 9–10
5. Raph M. . Pumpelly (N. Y. Nation, April 14, 1878)