...I am a man of science, not a speculator... 
Grant Allen 「An African Millionaire」
...When I learned the fact of my having been hired to a negro speculator,or a "soul-driver" as they are generally called among slaves, no one cantell my emotions...
William Wells Brown 「The Narrative of William W. Brown, a Fugitive Slave」
...No slave speculator ever dared to cross the threshold of this planter of the Old Dominion...
William Wells Brown 「Clotelle」
...The speculator had bought her, buthad postponed her removal till she should recover...
William Wells Brown 「Clotelle: a Tale of the Southern States」
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