Show tree rings to fix date I 1 of remote civilization reports of success have haie been made from the national nation at geographic society s expedition into the south a est which Is endeavoring to fix the date definitely of a remote civill civillia za tion which undoubtedly existed this la Is being done by a study of the tree rings as found in some timbers of the ancient structures this work will enable the scientists to date the period when the complex and highly developed civilization of chaco can yon produced the beautiful village pueblo bonito a communal dwell ing of some 2500 people centuries before the white man set foot on american soil the mementos of a civilization which rivaled those ot of the ancient old world culture of which the Boni tang apparently knew nothing have already been brought to washington from year to year but always there was as the perplexing question how old are they by minute study and comparisons of the rings of the timbers uncovered and old trees and stumps of the vicinity it Is hoped to arrive at a very acau rate date |