“The time is coming when really learned men will again be ashamed of
not seeing the value of all the uses of mind: when nothing but
thoughtlessness or impudence, mercurial brain or brazen forehead,
will aver that no knowledge is practical, except that which ends in
the use of material instruments.”—Prof. De Morgan (Arithmetical
Books 1847, p. 54).
LONDON
BERNARD QUARITCH 15 PICCADILLY
1880.
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