Job 41:32

He maketh a path to shine after him - This refers doubtless to the white foam of the waters through which he passes. If this were spoken of some monster that commonly resides in the ocean, it would not be unnatural to suppose that it refers to the phosphoric light such as is observed when the waters are agitated, or when a vessel passes rapidly through them. If it refers, however, to the crocodile, the allusion must be understood of the hoary appearance of the Nile or the lake where he is found.

One would think the deep to be hoary - Homer often speaks of the sea as πολιὴν θάλασσαν poliēn thalassan - “the hoary sea.” So Apollonius, speaking of the Argonauts, Lib. i. 545:

- μακραὶ δ ̓ αἰὲν ἐλευκαίνοντο κέλευθοι -

- makrai d' aien eleukainonto keleuthoi -

“The long paths were always white”

So Catullus, in Epith. Pelei:

Totaque remigio spumis incanuit unda.

And Ovid, Epis. Oeno:

- remis eruta canet aqua.

The rapid motion of an aquatic animal through the water will produce the effect here referred to.