I wish to acknowledge the kindness of the Editors of Harper's Magazine, Natural History, Asia Magazine and the Trans-Pacific Magazine in whose publications parts of this book have already appeared.
We are indebted to a host of friends who gave assistance to the expedition and to us personally in the field:
The Wai Chiao Pu (Ministry of Foreign Affairs) freely granted permits for the expedition to travel throughout China and extended other courtesies for which I wish to express appreciation on behalf of the President and Board of Trustees of the American Museum of Natural History.
In Peking, His Excellency Paul S. Reinsch, formerly American Minister to China, Dr. C. D. Tenney, Mr. Willys Peck, Mr. Ernest B. Price and other members of the Legation staff obtained import permits and attended to many details connected with the Chinese Government.
Mr. A. M. Guptil acted as our Peking representative while we were in the field and assumed much annoying detail in forwarding and receiving shipments of supplies and equipment. Other gentlemen in Peking who rendered us courtesies in various ways are Commanders I. V. Gillis and C. T. Hutchins, Dr. George D. Wilder, Dr. J. G. Anderson and Messrs. H. C. Faxon, E. G. Smith, C. R. Bennett, M. E. Weatherall and J. Kenrick.
In Kalgan, Mr. Charles L. Coltman arranged for the transportation of the expedition to Mongolia and not only gratuitously acted as our agent but was always ready to devote his own time and the use of his motor cars to further the work of the party.
In Urga, Mr. F. A. Larsen of Anderson, Meyer & Company, was of invaluable assistance in obtaining horses, carts and other equipment for the expedition as well as in giving us the benefit of his long and unique experience in Mongolia.
Mr. E. V. Olufsen of Anderson, Meyer & Company, put himself, his house, and his servants at our disposal whenever we were in Urga and aided us in innumerable ways.
Mr. and Mrs. Oscar Mamen often entertained us in their home. Mr. and Mrs. E. L. MacCallie, who accompanied us on one trip across Mongolia and later resided temporarily in Urga, brought equipment for us across Mongolia and entertained us while we were preparing to return to Peking.
Monsieur A. Orlow, Russian Diplomatic Agent in Urga, obtained permits from the Mongolian Government for our work in the Urga region and gave us much valuable advice.