Show delve into cliff dwellers dwelle I 1 rs history histo r sent out by the national PARTIES deo geographic ideograph graph ic society and the american museum of natural history are digging up ancient burled buried tree trunks and stumps in arizona and now new mexico in order to put together a connected history of the indians who built pueblos and lived there centuries ago an accurate chronology may be worked out it Is believed by the method developed by dr A E douglass professor of astronomy ant and phy at the university of arizona A cross of a modern or ancient tree ln in the hands of doctor douglass Is an almanac or annual register of the period in which it lived when enough buried trees of various ages havo have been studied lt it la Is believed that tin an exact year to year history of tile the flemate in tiny any given giren region may be worked dout out tho the rings which appear on the tre tree e between the coro core and the out outer er surface vary from year to year according to climate and other conditions ue ard ring about the core Is formed dur ing the first year of the trees life the second ring encircling the first grows in the following year and so on tills this process has been kept up tori for more than years in some of tho th giant redwoods of california call forkla the rings are distinctly marked mar ked because the growth Is different in spring ond summer from what it Is isan in the rust rost oft the year there la Is it a difference I 1 in n the cell growths of the fall which makes make q a dark color in the ring so that each years growth Is clearly britten 11 ritten on the cross section se jiin of the tree the application of the tykp study of annual tree rings to history and ar che lies iles in the fact that beams rafters and furniture will all show the varying tree ring patterns of the trees from which f they were cut c ut it if trees enough are found to trace tho the variations back several sevel al hun huni i dred or a few thousand years a stand a ord rd of bf comparison would exist which would enable the expert to t match an a ancient beam or piece of furniture furn with the ring pattern of its period MIA thus using fixing fix ing the ago almost exa exactly c uv |