Extermine

VVherever ſorrovv is, relief vvould be. / If you do ſorrovv at my grief in love, / By giving love your ſorrovv and my grief / VVere both extermined.

Without the instinct of self-preservation, which causes the sea-anemone to contract its tentacles, or the fish to dash into its hover, species would be extermined wholesale by involuntary suicide.