Moby Dick

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whale is A SPOUTING FISH WITH A HORIZONTAL TAIL. There you have
him. However contracted, that definition is the result of expanded
meditation. A walrus spouts much like a whale, but the walrus is not a
fish, because he is amphibious. But the last term of the definition is
still more cogent, as coupled with the first. Almost any one must have
noticed that all the fish familiar to landsmen have not a flat, but a
vertical, or up-and-down tail. Whereas, among spouting fish the tail,
though it may be similarly shaped, invariably assumes a horizontal
position.

By the above definition of what a whale is, I do by no means exclude
from the leviathanic brotherhood any sea creature hitherto identified
with the whale by the best informed Nantucketers; nor, on the other
hand, link with it any fish hitherto authoritatively regarded as alien.*
Hence, all the smaller, spouting, and horizontal tailed fish must be
included in this ground-plan of Cetology. Now, then, come the grand
divisions of the entire whale host.