_Assistant Curator of Mexican Archæology and Ethnology, Peabody Museum of Harvard. Illustrated with Drawings by Dr. Spinden and with Photographs_ My thanks are due first of all to the _New York Times_, which financed the Mason-Spinden Expedition; then to the Mexican Government, which permitted the Expedition to enter territory where foreigners are not commonly welcomed; third, to Mr. George Palmer Putnam, the United Fruit Company and the Chicle Development Company for advice in organization and--in the case of the last two,--for the use of invaluable facilities in the field. Finally, I am again indebted to the _New York Times_--and to _World’s Work_ and _Motor Boating_--for permission to …
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