As well as being a mythic tale, Moby-Dick is a superb guide to oceanography
Anyone who has read Moby-Dick will recognise the moment, 32 chapters in, when their line of attention, hitherto slackly paying out, snags. Having spirited us briskly through Manhattan, New Bedford and Nantucket, and having flushed Ahab from his lair on to the deck of the Pequod, Herman Melville divagates into a disquisition on whale taxonomies.