Statistics for occurrence #1 of “Mr. Higginson” in chapter 11 of Mary Thacher Higginson, Thomas Wentworth Higginson: the story of his life:

...id for what he called secret service, stating that he should need from five to eight hundred dollars within sixty days, for the perfecting of by far the most important undertaking of my whole life. Mr. Higginson asked if this project was connected with the underground railway and received this reply: Rail-Road business on a somewhat extended scale is the identical object for which I am trying to get means. ...
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