According to the Political Graveyard at

http://politicalgraveyard.com/bio/stewart.html

Stewart, William Morris (1827-1909) Born in Galen, N.Y., August 9, 1827.
California state attorney general, 1854-56; delegate to Nevada state
constitutional
convention, 1863; U.S. Senator from Nevada, 1864-75, 1887-1905. Died April
23, 1909.
Cremated; ashes originally interred at Laurel Hill Cemetery (which no longer
exists), San
Francisco, Calif.; reinterment to unknown location. (See also his
congressional biography.)
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>Date:    Thu, 5 Oct 2000 12:46:36 -0400
>From:    Scott Monje <[log in to unmask]>
>Subject:    Re: New York Sons and Daughters

>Regarding New Yorkers who went west:

>William Morris Stewart was born in the town of Galen in Wayne County, N.Y.,
in the 1820s. >His family then moved to Ohio, but he returned to Wayne
County, became a high school >math teacher in Lyons, and began studying law
in the office of a local attorney. After a stint >at Yale Law School (which
he didn't finish), he followed the gold rush out west, studied some >more
law, and ended up a prominent lawyer associated with corporate mining
interests, first >in California and then in Nevada. In 1864 he was elected as
one of Nevada's first U.S. >senators. Yet, for all his prominence, no one
seems to know the precise year in which he >was born. Perhaps, someone in
Wayne Co. could look it up.