In 1894 Andrew Ellicott Douglass (5th July, 1867 - 20th March,
1962), an American astronomer, began his work on the theory of
dendrochronology, after noticing that tree ring growth differed in
width depending on climatic change. Dendrochronology, the science
of dating wood by studying its growth ring patterns, has been used
in a wide range of disciplines, including ecology, archeology and
hydrology. In 1937 Douglass established the Laboratory of Tree-Ring
Research at the University of Arizona.
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