Before mankind introduced civil society, old age did not exist in the world, nor other lingering diseases; as all living creatures, as soon as they became too feeble to defend themselves, were slain and eaten by others, except the young broods, who were defended by their mother; and hence the animal world existed uniformly in its greatest strength and perfection; see Additional Note VII.] "But REPRODUCTION with ethereal fires New Life rekindles, ere the first expires; Calls up renascent Youth, ere tottering age Quits the dull scene, and gives him to the stage; Bids on his cheek the rose of beauty blow, And binds the wreaths of pleasure round his brow; With finer links the vital chain extends, And the long line of Being never ends. 20 [Footnote: _But Reproduction_, l. 13. See Additional Note VIII.] "Self-moving Engines by unbending springs May walk on earth, or flap their mimic wings; In tubes of glass mercurial columns rise, Or sink, obedient to the incumbent skies; Or, as they touch the figured scale, repeat The nice gradations of circumfluent heat. But REPRODUCTION, when the perfect Elf Forms from fine glands another like itself, Gives the true character of life and sense, And parts the organic from the chemic Ens.-- 30 Where milder skies protect the nascent brood, And earth's warm bosom yields salubrious food; Each new Descendant with superior powers Of sense and motion speeds the transient hours; Braves every season, tenants every clime, And Nature rises on the wings of Time. [Footnote: _Unbending springs_, l. 21. See Additional Note I. 4.] "As LIFE discordant elements arrests, Rejects the noxious, and the pure digests; Combines with Heat the fluctuating mass, And gives a while solidity to gas; 40 Organic forms with chemic changes strive, Live but to die, and die but to revive! Immortal matter braves the transient storm, Mounts from the wreck, unchanging but in form.--