The differences of earths and the trial of them, are worthy to be diligently inquired […] It is thought by some, that the ends of low rainbows fall more upon one kind of earth than upon another; as it may well be; for that that earth is most roscid: and therefore it is commended for a sign of good earth.
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For all the while her purged ashes rest / These rellicks dry suck in the heavenly dew, / And roscid Manna rains upon her breast, / And fills with sacred milk sweet fresh and new, / Where all take life and doth the world renew;
Source: wiktionary
But in that expression, “the lilies drop forth myrrh,” neither proper lilies nor proper myrrh can be apprehended, the one not proceeding from the other, but may be received in a metaphorical sense: and in some latitude may be made out from the roscid and honey drops observable in the flowers of martagon, and inverted flowered lilies, and, 'tis like, is the standing sweet dew on the white eyes of the crown imperial, now common among us.
Source: wiktionary