Q: What happened to the moon in 1740? (asks Gary Barwin, author of the celebrated
Moon Baboon Canoe)
A: In 1740 a pamphlet was published that seriously argued that swallows migrated annually to the moon (T. A. Coward,
The Migration of Birds, 1912, p. 117). Your chart depicts the stir of a multitudinous (if not loon-y) flock of flyers.