Longevity has ever been a desirable object among the rational part of mankind; though the licentious epicure appears to measure the duration of his life by the good things he has enjoyed, rather than by the number of years he has lived.

Longevity depends on a variety of circumstances, which, since the introduction of manifold luxuries, rarely unite in the same person : the principal of these is an heredi-tany disposition, which might be more regularly transmitted to children, if the frequent abuse of solid and liquid aliment, especially the custom of giving them fermented and spirituous liquors, together with the indulgence in the fashionable enervating passions, were not alike conspicuous in the present state of society, amon.g youth and adults.

Other requisites to longevity are, a perfect birth or formation of the infant, supported by proper and rational treatment ; a gradual cultivation of the mind; a constitution uncontaminated by hereditary disease ; and a tranquillity that is not easily disturbed by external objects. Where these conditions prevail, and strict temperance is observed, there is a prospect of attaining to a mature old age -from the contrary causes, or conduit of individuals, the .alarming increase of deaths in large towns, may be easily explained ; and especially if it be contrasted with the more simple, though gross, habits of a country-life.- See LIFE and DEATH.