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270 with conjectures on things more remote, with catalogues of the fixed stars, and calculations of the bulk of planets.

It had been a task worthy of the moral philosophers to have considered with equal care the climactericks of the mind; to have pointed out the time at which every passion begins and ceases to predominate, and noted the regular variations of desire, and the succession of one appetite to another.

The periods of mental change are not to be stated with equal certainty: our bodies grow up under the care of nature, and depend so little on our own management, that something more than negligence is necessary to discompose their structure or impede their vigour. But our minds are committed in a great measure first to the direction of others, and afterwards of ourselves. It would be difficult to protract the weakness of infancy beyond the usual time, but the mind may be very easily hindered from its share of improvement, and the bulk and strength of manhood must, without the assistance of education and instruction, be informed only with the understanding of a child.

Yet amidst all the disorder and inequality which variety of discipline, example, conversation, and employment produce in the intellectual advances of different men, there is still discovered, by a vigilant spectator, such a general and remote similitude, as may be expected in the same common nature affected by external circumstances indefinitely varied. We all enter the world in equal ignorance, gaze round about us on the same objects, and have our first pains and pleasures, our