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stone, mediæval chemists made many of the great discoveries on which modern chemistry is founded; so, in the elaborate and careful consideration of the difficulties of psychology, should those difficulties themselves receive no solution, important truths must be nevertheless incidentally discovered or confirmed. If so, the labourer will not be without his reward.

But, above all things, the writer is anxious to guard himself against any suspicion of dogmatising or laying down the law certainly or conclusively on any of the topics discussed.

He proposes to examine, to discuss, to sift them; but, while he is ready to point out the conclusion to which the examination appears to him legitimately to lead, he has earnestly endeavoured to express his opinions in that spirit of respect for others, toleration, and Christian charity, which a mind engaged in the earnest and honest search after truth learns from the very nature of its labours.

To suggest an elevated train of thought, and to promote an earnest inquiry after truth in its purity, are the main objects of his work.



The word Time has two meanings : the one arbitrary, the

other absolute. The second the object of inquiry. Its
various aspects. Effect of change in the observer's position,
east or west. Undulations of light and sound carried
onwards into space. Effects perceived by sentient Beings
on earth if travelling with similar rapidity ; and if
travelling at their ordinary speed ; and if travelling into


Self-consciousness of its existence. Coexistent with self.

Opinions of antiquity as to its immortality. Plato sup-

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