page 192 : Besides, when making a passage from one feeding-ground to another, the Sperm Whales, guided by some infallible instinct  say, rather, secret intelligence from the Deity  mostly swim in veins, as they are called: continuing their way along a given ocean-line with such undeviating exactitude, that no ship ever sailed her course, by any chart, with one tithe of such marvellous precision.