The Baron F. VON RICHTHOFEN, now President of the Geographical Society of Berlin, a traveller who not only has trodden many hundreds of miles in the footsteps of our Marco, but has perhaps travelled over more of the Interior of China than Marco ever did, and who carried to that survey high scientific accomplishments of which the Venetian had not even a rudimentary conception, has spontaneously opened his bountiful stores of new knowledge in my behalf. Mr. NEY ELIAS, who in 1872 traversed and mapped a line of upwards of 2000 miles through the almost unknown tracts of Western Mongolia, from the Gate in the Great Wall at Kalghan to the Russian frontier in the Altai, has done likewise.[1] To the Rev. G. MOULE, of the Church Mission at Hang-chau, I owe a mass of interesting matter regarding that once great and splendid city, the KINSAY of our Traveller, which has enabled me, I trust, to effect great improvement both in the Notes and in the Map, which illustrate that subject. And to the Rev. CARSTAIRS DOUGLAS, LL.D., of the English Presbyterian Mission at Amoy, I am scarcely less indebted. The learned Professor BRUUN, of Odessa, whom I never have seen, and have little likelihood of ever seeing in this world, has aided me with zeal and cordiality like that of old friendship. To Mr. ARTHUR BURNELL, Ph.D., of the Madras Civil Service, I am grateful for many valuable notes bearing on these and other geographical studies, and particularly for his generous communication of the drawing and photograph of the ancient Cross at St. Thomas’s Mount, long before any publication of that subject was made on his own account. My brother officer, Major OLIVER ST. JOHN, R.E., has favoured me with a variety of interesting remarks regarding the Persian chapters, and has assisted me with new data, very materially correcting the Itinerary Map in Kerman. Mr. BLOCHMANN of the Calcutta Madrasa, Sir DOUGLAS FORSYTH, C.B., lately Envoy to Kashgar, M. de MAS LATRIE, the Historian of Cyprus, Mr. ARTHUR GROTE, Mr. EUGENE SCHUYLER of the U.S. Legation at St. Petersburg, Dr. BUSHELL and Mr. W. F. MAYERS, of H.M.’s Legation at Peking, Mr. G. PHILLIPS of Fuchau, Madame OLGA FEDTCHENKO, the widow of a great traveller too early lost to the world, Colonel KEATINGE, V.C., C.S.I., Major-General KEYES, C.B., Dr. GEORGE BIRDWOOD, Mr. BURGESS, of Bombay, my old and valued friend Colonel W. H. GREATHED, C.B., and the Master of Mediæval Geography, M. D’AVEZAC himself, with others besides, have kindly lent assistance of one kind or another, several of them spontaneously, and the rest in prompt answer to my requests.