Look at chapter 68, "The Blanket". After writing about the definition and classification of whales, the whiteness of whales, the Gam (the social meeting of 2 whaling ships), the whales' attacks, the books about whales, the pictures of whales, the inaccurate representation of whales, the food of whales (squids), the whaling line, the whaling scene, the dart in the capture of whales, the crotch that keeps the harpoon for attacking whales, the way whale meat should be cooked, the whale as a dish, and so on and so forth, Ishmael now writes about the whale's skin.
"In life, the visible surface of the Sperm Whale is not the least among the many marvels he presents. Almost invariably it is all over obliquely crossed and re-crossed with numberless straight marks in thick array, something like those in the finest Italian line engravings. But these marks do not seem to be impressed upon the isinglass substance above mentioned, but seem to be seen through it, as if they were engraved upon the body itself. Nor is this all. In some instances, to the quick, observant eye, those linear marks, as in a veritable engraving, but afford the ground for far other delineations. These are hieroglyphical; that is, if you call those mysterious cyphers on the walls of pyramids hieroglyphics, then that is the proper word to use in the present connexion. By my retentive memory of the hieroglyphics upon one Sperm Whale in particular, I was much struck with a plate representing the old Indian characters chiselled on the famous hieroglyphic palisades on the banks of the Upper Mississippi. Like those mystic rocks, too, the mystic-marked whale remains undecipherable. This allusion to the Indian rocks reminds me of another thing. Besides all the other phenomena which the exterior of the Sperm Whale presents, he not seldom displays the back, and more especially his flanks, effaced in great part of the regular linear appearance, by reason of numerous rude scratches, altogether of an irregular, random aspect..."(my emphasis)
This reminds me of chapter 3- the 1st thing Ishmael describes about Queequeg is his skin:
"It was of a dark, purplish, yellow colour, here and there stuck over with large blackish looking squares. Yes, it's just as I thought, he's a terrible bedfellow; he's been in a fight, got dreadfully cut, and here he is, just from the surgeon. But at that moment he chanced to turn his face so towards the light, that I plainly saw they could not be sticking-plasters at all, those black squares on his cheeks. They were stains of some sort or other. [...] He now took off his hat—a new beaver hat—when I came nigh singing out with fresh surprise. There was no hair on his head—none to speak of at least—nothing but a small scalp-knot twisted up on his forehead. His bald purplish head now looked for all the world like a mildewed skull.(my emphasis)
Meanwhile, he continued the business of undressing, and at last showed his chest and arms. As I live, these covered parts of him were checkered with the same squares as his face; his back, too, was all over the same dark squares; he seemed to have been in a Thirty Years' War, and just escaped from it with a sticking-plaster shirt. Still more, his very legs were marked, as if a parcel of dark green frogs were running up the trunks of young palms..."
The passage describing the whale's skin ends with this remark:
"It also seems to me that such scratches in the whale are probably made by hostile contact with other whales; for I have most remarked them in the large, full-grown bulls of the species."Now look at this line from the passage about Ishmael's 1st impression of Queequeg:
"I remembered a story of a white man—a whaleman too—who, falling among the cannibals, had been tattooed by them. I concluded that this harpooneer, in the course of his distant voyages, must have met with a similar adventure."Also from chapter 68:
"A word or two more concerning this matter of the skin or blubber of the whale. It has already been said, that it is stript from him in long pieces, called blanket-pieces. Like most sea-terms, this one is very happy and significant. For the whale is indeed wrapt up in his blubber as in a real blanket or counterpane; or, still better, an Indian poncho slipt over his head, and skirting his extremity. It is by reason of this cosy blanketing of his body, that the whale is enabled to keep himself comfortable in all weathers, in all seas, times, and tides. What would become of a Greenland whale, say, in those shuddering, icy seas of the North, if unsupplied with his cosy surtout? True, other fish are found exceedingly brisk in those Hyperborean waters; but these, be it observed, are your cold-blooded, lungless fish, whose very bellies are refrigerators; creatures, that warm themselves under the lee of an iceberg, as a traveller in winter would bask before an inn fire; whereas, like man, the whale has lungs and warm blood. Freeze his blood, and he dies. How wonderful is it then—except after explanation—that this great monster, to whom corporeal warmth is as indispensable as it is to man; how wonderful that he should be found at home, immersed to his lips for life in those Arctic waters! where, when seamen fall overboard, they are sometimes found, months afterwards, perpendicularly frozen into the hearts of fields of ice, as a fly is found glued in amber. But more surprising is it to know, as has been proved by experiment, that the blood of a Polar whale is warmer than that of a Borneo negro in summer."(my emphasis)
This makes me think of a passage in chapter 11, again about Ishmael and Queequeg:
"... Yes, we became very wakeful; so much so that our recumbent position began to grow wearisome, and by little and little we found ourselves sitting up; the clothes well tucked around us, leaning against the head-board with our four knees drawn up close together, and our two noses bending over them, as if our kneepans were warming-pans. We felt very nice and snug, the more so since it was so chilly out of doors; indeed out of bed-clothes too, seeing that there was no fire in the room. The more so, I say, because truly to enjoy bodily warmth, some small part of you must be cold, for there is no quality in this world that is not what it is merely by contrast. Nothing exists in itself. If you flatter yourself that you are all over comfortable, and have been so a long time, then you cannot be said to be comfortable any more. But if, like Queequeg and me in the bed, the tip of your nose or the crown of your head be slightly chilled, why then, indeed, in the general consciousness you feel most delightfully and unmistakably warm. For this reason a sleeping apartment should never be furnished with a fire, which is one of the luxurious discomforts of the rich. For the height of this sort of deliciousness is to have nothing but the blanket between you and your snugness and the cold of the outer air. Then there you lie like the one warm spark in the heart of an arctic crystal."(my emphasis)
Look at that again:
"For the height of this sort of deliciousness is to have nothing but the blanket between you and your snugness and the cold of the outer air. Then there you lie like the one warm spark in the heart of an arctic crystal."