"All I want is a good listener": promiscuous apostrophe at the start of "Scenes Beyond the Western Border"

The beginning of Typee displays another of Melville's techniques, what can be called promiscuous apostrophe. He begins by addressing the reader directly, fades into soliloquy, and in subsequent paragraphs addresses the rooster, another sailor, and the "poor old ship" itself. The impression created is of a voice ready to fix on any imaginable auditor.  --Bryan C. Short on Melville's Self-Discovery in Typee

Oh reader! "gentle" or not,—I care not a whit,—so you are honest—I will tell you a secret. I write not to be read, and I swear never even to transcribe for your benefit, unless I change my mind. All I want is a good listener; I want to converse with you; and if you are absolutely dumb, why I will sometimes answer for you.

(opening lines of the first installment of "Scenes Beyond the Western Border," Southern Literary Messenger vol. 17, June 1851, 372; and Scenes and Adventures in the Army, Part II.)

But "Oh reader!" only makes one apostrophe—when does it get promiscuous? From the same first chapter:

Oh, wide and flat,—shall I say "stale and unprofitable"—prairies! ...
Oh, gentle Herald [Mercury], that I could fly with thee!
Oh! ye hypocrites,—demagogues....
"Friend," thought I ....
Oh Truth!
Oh Sirius! thou brightest and nearest sun;
"Immortal man, brave General ———."
Oh Steam!

All these occur in quick succession, right at the start of "Scenes Beyond the Western Border."

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