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To a landsman, no whale, nor any sign of a herring, would have been visible at that moment; nothing but a troubled bit of greenish white water, and thin scattered puffs of vapor hovering over it, and suffusingly blowing off to leeward, like the confused scud from white rolling billows. The air around suddenly vibrated and tingled, as it were, like the air over intensely heated plates of iron. Beneath this atmospheric waving and curling, and partially beneath a thin layer of water, also, the whales were swimming. Seen in advance of all the other indications, the puffs of vapor they spouted, seemed their forerunning couriers and detached flying outriders.