The study of the history of mathematical notations was sug-
gested to me by Professor E. H. Moore, of the University of Chicago.
To him and to Professor M.W. Haskell, of the University of California,
I rm indebted for encouragement in the pursuit of this research. As
completed in August, 1925, the present history was intended to be
brought out in one volume. To Professor H. E. Slaught, of the Uni-
versity of Chicago, I owe the suggestion that the work be divided into
two volumes, of which the first should limit itself to the history of
synlbols in elementary mathematics, since such a volume would ap-
peal to a wider constituency of readers than would be the case with
the part on symbols in higher mathematics. To Professor Slaught I
also owe generous and vital assistance in many other ways. He exam-
ined the entire manuscript of this work in detail, and brought it to
the sympathetic attention of the Open Court Publishing Company. I
desire to record my gratitude to Mrs. Mary IIegeler Carus, president
of the Open Court Publishing Company, for undertaking this expen-
sive publication from which no financial profits can be expected to
accrue.
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