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11. the leaving a posterity. Mixed construction. Leaving should be used either as a gerund, leaving a posterity, or as a verbal noun, the leaving of a posterity.
14. nicer. More delicate.
17. birth. That which they bear, their offspring. Cf. Shakespeare, Othello, I. iii. 410:
Hell and night
Must bring this monstrous birth to the world's light.
30. temper. Temperature.
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34. which. sc. a circumstance which.
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1. as it spreads. To the degree in which it spreads.