Note 401 — Chapter VI · THE PROTO-SIDERIC OR EARLY IRON AGE OF WEAPONS.

Notes from Mr. Henderson’s Diary during a Ramble through Shansi, in March 1874, published by Mr. Day (Appendix D, p. 251). Colonel Yule (Marco Polo, ii. 429), alluding to these enormous deposits of coal and metal, says: ‘Baron Richtofen, in the paper which we quote from, indicates the revolution in the deposit of the world’s wealth and power, to which such facts, combined with other characteristics of China, point as probable; a revolution so vast that its contemplation seems like that of a planetary catastrophe.’