Moby Dick

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Reckoning the largest sized Sperm Whale's tail to begin at that point of
the trunk where it tapers to about the girth of a man, it comprises
upon its upper surface alone, an area of at least fifty square feet. The
compact round body of its root expands into two broad, firm, flat palms
or flukes, gradually shoaling away to less than an inch in thickness.
At the crotch or junction, these flukes slightly overlap, then sideways
recede from each other like wings, leaving a wide vacancy between. In
no living thing are the lines of beauty more exquisitely defined than in
the crescentic borders of these flukes. At its utmost expansion in the
full grown whale, the tail will considerably exceed twenty feet across.

The entire member seems a dense webbed bed of welded sinews; but cut
into it, and you find that three distinct strata compose it:--upper,
middle, and lower. The fibres in the upper and lower layers, are
long and horizontal; those of the middle one, very short, and running
crosswise between the outside layers. This triune structure, as much as
anything else, imparts power to the tail. To the student of old Roman