Logo IMG
HOME > My Amsci > Restricted Access

Restricted Access The content you've requested is available without charge only to active Sigma Xi members and American Scientist subscribers.

If you are an active member or an individual subscriber, please log in now in order to access this article.

If you are not a member or individual subscriber, you can:


Figure 1. Andrew Ellicott DouglassClick to Enlarge Image

Andrew Ellicott Douglass, an astronomer, single-handedly invented the science of dedrochronology in order to further his research into the relation between sunspot cycles and climate. Although his lifelong search for that link proved fruitless, in the process he established all the major principles of tree-ring dating—including the value of long-lived trees such as the Giant Sequoia—and managed to determine the date of construction of Anasazi dwellings near Four Corners, Arizona. The Laboratory of Tree-Ring Research at the University of Arizona is another of this remarkable scientist’s legacies.

Connect With Us:


Subscribe to Free eNewsletters!

Read Past Issues on JSTOR

JSTOR, the online academic archive, contains complete back issues of American Scientist from 1913 (known then as the Sigma Xi Quarterly) through 2005.

The table of contents for each issue is freely available to all users; those with institutional access can read each complete issue.

View the full collection here.

RSS Feed Subscription

Receive notification when new content is posted from the entire website, or choose from the customized feeds available.

Write for American Scientist

Review our submission guidelines.

Subscribe to American Scientist