Slack family.

Slack family of Iberville Parish, La., included Eliphalet Slack (1778-1843), who moved to Louisiana from Weston, Mass., in 1829-1830, and Henry Richmond Slack (1835-1890), member of the Yale College class of 1855, sugar planter, and Confederate officer. The chief agricultural pursuit of the Slack family in Louisiana changed from cotton growing to sugar growing around 1834.

From the description of Slack family papers, 1805-1891 (bulk 1830s-1891) [manuscript]. WorldCat record id: 22875753