[Greek:--Amphi d anthro- pon phresin amplakiai Anarithmatoi kremantai Touto d amachanon eurein, O ti nun, kai en teleu- ta, phertaton andri tuchein.] PINDAR, Ol. vii. 43. [Transcriber's note: line breaks and hyphenation in original.] But wrapt in error is the human mind, And human bliss is ever insecure: Know we what fortune yet remains behind? Know we how long the present shall endure? WEST. The writers of medicine and physiology have traced, with great appearance of accuracy, the effects of time upon the human body, by marking the various periods of the constitution, and the several stages by which animal life makes its progress from infancy to decrepitude. Though their observations have not enabled them to discover how manhood may be accelerated, or old age retarded, yet surely, if they be considered only as the amusements of curiosity, they are of equal importance 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.