That the mean duration of life amongst the indigenous inhabitants of one part of the globe differs more or less from that which obtains amongst those of other parts, there is every reason to believe. It is probable that a difference exists even when comparing the most civilized nations of Europe one with another; and still more may we look for discrepancies when we carry our investigations amongst the natives of more remote and less civilized lands.The climate, extent of cultivation, modes of life, state of public morals, each and all of them have a tendency to affect the longevity of the human race, and will not fail to make their influence felt in proportion as their good or evil energies are called into existence.