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AN OUTLINE OF THE NECESSARY

LAWS OF THOUGHT;

A TREATISE ON PURE AND

APPLIED LOGIC.

BY WILLIAM THOMSON, M. A.

FELLOW AND TUTOR OF QUEEN'S COLLEGE OXFORD.

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Καλή μεν ούν και θεία, ευ ίσθι, η ορμή, ήν ορμας επί τους λόγους: ελκυσον δε σαυτόν και γυμνασαι μάλλον δια της δοκούσης αχρήστου είναι και καλουμένης υπό των πολλών άδολεσχίας, έως έτι νέος εί· ει δε μή, σε διαφεύξεται η αλήθεια.

PLATO. .

TO

SIR WILLIAM HAMILTON, BAR T.

PROFESSOR OF LOGIC AND METAPHYSICS IN THE

UNIVERSITY OF EDINBURGH,

ETC. ETC.

THIS ESSAY

IS BY HIS PERMISSION INSCRIBED.

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OME account of the exact

position which this work pretends to occupy amidst a crowd of valuable treatises on

the same subject, may not be an unfitting introduction to its pages. The system of Pure Logic or Analytic that has been universally accepted for centuries past, is very defective as an instrument for the analysis of natural reasoning. Arguments that commend themselves to any untaught mind as valid and practically important, have no place in a system that professedly includes all reasoning whatever : and an attempt to reduce to its technical forms the first few

of

any scientific work, has generally ended in failure and disgust. The consequence has been that the more popular writers on Logic have begun to treat its strictly technical parts with a certain coyness

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