The Pell equation, by Edward Everett Whitford.

VITA.
Edward Everett Whitford was born in Brookfield, N. Y.,
January 31, 1865; graduated from Brookfield Academy
in 1881; received the degree of A.B. from Colgate University in 1886 and of A.M. in 1890. He taught in Colby
Academy, New London, N. H., Keystone Academy,
Factoryville, Pa., Shamokin (Pa.) High School, Commercial High School and Pratt Institute, Brooklyn, N. Y.
He was principal of Brookfield High School, 1900-1.
He is now instructor in mathematics in the College of the
City of New York with which institution he has been
connected since 1905. He has been a graduate student
in Columbia University since February, 1904, and is a
member of the American Mathematical Society.
The writer takes this opportunity of expressing his
thanks to Professor David Eugene Smith for fruitful
suggestions and able and helpful criticism.
523 WEST 151ST STR., NEW YORK,
December, 1911.

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