Statistics for occurrence #1 of “Mr. Cass” in chapter 24, page 191 of Edward L. Pierce, Memoir and letters of Charles Sumner: volume 2:

...1, known as the Quintuple Treaty, between Great Britain, Austria, Prussia, and Russia, the slave-trade was declared piracy, and a mutual right of search given. France, acting under the influence of Mr. Cass and Mr. Wheaton, refused to ratify it. The slave-traders often hoisted the American flag in order to protect themselves from search and capture. Great Britain asserted the right to stop vessels fly...
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