Statistics for occurrence #1 of “Messrs. J. J. Clarke” in chapter 24, page 380 of Thomas Wentworth Higginson, Harvard Memorial Biographies:

...oral qualities. On leaving college he was engaged as an assistant in the private classical school of Mr. E. S. Dixwell in Boston. Whilst occupying this position, and afterwards in the office of Messrs. J. J. Clarke and Lemuel Shaw, he studied law. He passed the usual examination and was admitted to the Suffolk Bar on the very day when he left home as a soldier. In the summer of 1860, to recruit his health, he...
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