THE MACMILLAN COMPANY
NEW YORK · BOSTON · CHICAGO · DALLAS
ATLANTA · SAN FRANCISCO
MACMILLAN & CO., LIMITED
LONDON · BOMBAY · CALCUTTA
MELBOURNE
THE MACMILLAN COMPANY
OF CANADA, Limited
TORONTO
THE PSYCHOLOGY OF
ARITHMETIC
BY
EDWARD L. THORNDIKE
TEACHERS COLLEGE, COLUMBIA
UNIVERSITY
New York
THE MACMILLAN COMPANY
1929
All rights reserved
Copyright, 1922,
By THE MACMILLAN COMPANY.