[Footnote 1: Although at one period of our life we took great pains to make
a collection of the _periodicals_ which, during the last century, were
devoted wholly or partially to mathematics, yet we could never even
approximate towards completeness. It was not, certainly, from niggardly
expenditure. Indeed, it is doubtful whether a complete set exists, or could
even be formed now.]
[Footnote 2: See _Philosophical Magazine_, Sept. 1850.]
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