Here you will find the Poem Epigram of poet William Cowper
To purify their wine some people bleed A lamb into the barrel, and succeed; No nostrum, planters say, is half so good To make fine sugar, as a negro's blood. Now lambs and negroes both are harmless things, And thence perhaps this wondrous virtue springs. 'Tis in the blood of innocence alone-- Good cause why planters never try their own.