Here is a bit more of the "snippet" on the Gale book copied from Google Books:

Richard Henry Dana, Jr‎ - Page 47
Robert L. Gale - Biography & Autobiography - 1969 - 191 pages
'Grog time a day,' 'Hurrah! hurrah! my hearty bullies!' or 'Round the corner,
Sally!"' (257). April 15 brought the Pilgrim, commanded by Faucon, ...
Snippet view

Not only does this add "Grog time a day", but also it adds "Sally" to "Round the corner". I looked at a number of the online versions of different editions and this doesn't show up in any of them.

Here's all I could find on the different editions:

"There are three editions of Two Years before the Mast.

1.The original 1840 edition.

2. The 1869 edition - this is a revision by Dana himself, after the original copyright has expired. Among many changes, Dana removes the "sharply unromantic opening paragraphs" and the final chapter. He adds a new chapter "Twenty Fours Years After"

3. The 1911 edition - prepared by his son Richard Henry Dana based upon the 1869 edition. The son adds research about the Crew, and a Dictionary of Nautical Terms based on Dana's "The Seaman's Friend", an Introduction and a new chapter "Seventy Five Years After"

I'll be very interested to see what you find Lighter.