Boole (tree) the largest in Converse Basin Grove, was named around 1895 by A.H. Sweeny, a Fresno doctor, after Franklin A. Boole, a supervisor of the logging operation who spared the tree's life due to its great size. Before 1931, it was thought by many to be the largest tree in the world (although the General Grant Tree was more popularly known as the largest tree in the world at that time), but it is now known as the sixth largest tree, after five other giant sequoias: the General Sherman tree, the General Grant, the President tree, the Lincoln tree, and the
Grizzly Giant sequoias in Yosemite National Park, with several hundred mature examples of the tree. Two of its trees (the Washington tree and the Grizzly Giant) are among the largest giant sequoias in the world. The Mariposa Grove's Washington tree is not to be confused with the more famous Washington tree in the Giant Forest of Sequoia National Park, which partially collapsed in January 2005. Grizzly Giant The Grizzly Giant is a giant sequoia in Mariposa Grove, located in Yosemite National Park. The tree has been measured many times, most recently in 1990 by Wendell Flint. It has a volume of ,