Show tree rings to fix date of remote civilization reports of success have been nande made from the national geographic socie tys expedition into the southwest which Is endeavoring to fix the date definitely of a remote elvi civilization liza which undoubtedly existed this Is being done by a study of the tree rings as f found in some timbers of the ancient structures this work will enable the scientists to date the period when the complex and highly developed of chaco can yoh produced the beautiful village pueblo bonato a communal dwelling of some soine 2500 people centuries before tho the white roan man set foot on american soil the mementos of 0 a which rivaled those of the old world culi culture ure of which apparently knew nothing have bave already been brought to washington from year to year but always there was the perplexing question how old are they by minute study and comparisons of the rin rings gs of the timbers uncover uncovered ed and old trees and stumps of the vicinity it Is hoped to td arrive at a very accurate date |