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THE

38039

ELEMENTS

OF

ARITHMETIC.

BY

AUGUSTUS DE MORGAN,

OF TRINITY COLLEGE, CAMBRIDGE; ONE OF THE VICE-PRESIDENTS OF THE
ROYAL ASTRONOMICAL SOCIETY; FELLOW OF THE CAMBRIDGE PHILO-
SOPHICAL SOCIETY; AND PROFESSOR OF MATHEMATICS IN UNIVERSITY
COLLEGE, LONDON.

FOURTH EDITION.

"Ce n'est point par la routine qu'on s'instruit, c'est par sa propre réflexion;
et il est essentiel de contracter l'habitude de se rendre raison de ce qu'on fait :
cette habitude s'acquiert plus facilement qu'on ne pense; et une fois acquise,
elle ne se perd plus."-CONDILLAC.

LONDON:

PRINTED FOR TAYLOR AND WALTON,

BOOKSELLERS AND PUBLISHERS TO UNIVERSITY COLLEGE,
28 UPPER GOWER STREET.

M.DCCC.XL.

QA
101
•D386
1840

LONDON:

PRINTED BY MOYES AND BARCLAY,

Castle Street, Leicester Square.

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