Statistics for occurrence #1 of “Mr. Mason” in chapter 4.16 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War: Volume 2.:

... adding that their commanders had expressed great indignation, and would make the most of our treatment of one of their merchantmen. Really, she added, Captain Wilkes is playing into our hands! Mr. Mason here suggested that it would be just as well not to discuss these matters at such a time. Captain Wilkes's offer of his cabin was conveyed by me to Mrs. Slidell and Mrs. Eustis, and declined by bot...
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