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As soil water declines through the summer, the cells become thicker-walled and more dense.

Thus each annual ring consists of early (light) and late (dark) wood. Douglass, the 'father' of dendrochronology was interested in the affect of sunspots on the earth’s climate.

The phenomenon of tree rings and their relationship with wet and dry years had been noticed before Douglass.

There is a brief note in one of Leonardo da Vinci's notebooks, and Charles Babbage in 1837 came up with the same idea.

Tree-rings are wider or narrower, brighter or darker and they reflect conditions under which the tree grew, mainly the climate conditions.

The ring widths, the anatomical characteristics of the wood, and other features of their growth vary from year to year with changing environmental conditions.

Reliability of age: reliability of technique and association How to know full or absolute age in years before present of different parts of the sequence. Assignment of an age to a physical remain based on direct analysis of that physical remain.

Problems like this are fixed by comparing one part of the world with another.Many trees in temperate zones make one growth ring each year, with the newest adjacent to the bark.Through a tree's life, a year-by-year ring pattern is formed which reflects the climatic conditions in which the tree grew.This chronometric technique is the most precise dating tool available to archaeologists who work in areas where trees are particularly responsive to annual variations in precipitation, such as the American Southwest. These cross-dated sequences, called chronologies, vary from one part of the world to the next. Douglass pioneered the science of tree rings in this 1929 article titled "The Secret of the Southwest Solved by Talkative Tree Rings." Includes numerous fascinating historic photographs. Douglass in the 1920s, dendrochronology—or tree-ring dating—involves matching the pattern of tree rings in archaeological wood samples to the pattern of tree rings in a sequence of overlapping samples extending back thousands of years.They are the result of cell formation outwards from the pith (the oldest part of the tree).