Breathing

But owing to his marked internal structure which gives him regular lungs, like a human being’s, the whale can only live by inhaling the disengaged air in the open atmosphere. Wherefore the necessity for his periodical visits to the upper world. But he cannot in any degree breathe through his mouth, for, in his ordinary attitude, the Sperm Whale’s mouth is buried at least eight feet beneath the surface; and what is still more, his windpipe has no connexion with his mouth.

No, he breathes through his spiracle alone; and this is on the top of his head.

If I say, that in any creature breathing is only a function indispensable to vitality, inasmuch as it withdraws from the air a certain element, which being subsequently brought into contact with the blood imparts to the blood its vivifying principle, I do not think I shall err; though I may possibly use some superfluous scientific words. Assume it, and it follows that if all the blood in a man could be aerated with one breath, he might then seal up his nostrils and not fetch another for a considerable time.

Now, if after he fetches a few breaths you alarm him, so that he sounds, he will be always dodging up again to make good his regular allowance of air. And not till those seventy breaths are told, will he finally go down to stay out his full term below. Remark, however, that in different individuals these rates are different; but in any one they are alike.