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Putting all these vespertilian speculations out of our way, the human facts concerning colour are briefly these.
Proserpina, Volume 1 Studies Of Wayside Flowers John Ruskin 1859
Vespertilian refers to bats, which come out at dusk, when the evening star (Vesperus) appears and when monks say their evening prayers (vespers).
“A Way with Words” Is “Car Talk” for Lexiphiles Condé Nast 2020