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doi: 10.1038/018519b0
DR. DREW'S letter in NATURE, vol. xviii. p. 489, recalls to my mind a similar phenomenon witnessed by myself and a friend on August 3, while crossing from Grimsby to Rotterdam. It was towards evening, when, looking ahead, we saw, about a mile distant, what appeared to be a long, low, black hull, without masts or funnel, moving through the water at enormous speed. After a minute or two it undulated and rose from the surface, and we saw that it was a flight of birds.
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