Show tree rings to fix date of remote civilization reports of success have been made from the national geographic socie tys expedition into the southwest which Is endeavoring to fix the date definitely of a remote civilization which un existed this 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 ohp complex and highly developed civilization of chaco canavon produced the beautiful village pueblo bonito a communal dwelling of some 2500 people centuries before the white man set foot on american soil the mementos of a civilization which rivaled those of the ancient old world culture of which the Bon itans apparently knew nothing have already been brought to lV washington ashington from year to year but always there was the perplexing question now 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 arrives at a very acau rate date |