Statistics for occurrence #1 of “Mr. Jackson” in chapter 1 of Historic leaves, volume 2, April, 1903 - January, 1904:

...the midst of his jokes, as: The man who always says what he thinks should think well what he says. Again, The man who knows that he doesn't know everything, knows something. So said Socrates. Mr. Jackson contributed to the Boston Courier, the Boston Commercial Bulletin, the New York Independent, and the Atlantic Monthly. He wrote many songs, and was the author of a popular opera-cantata, called The...
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