The Thomas Leech collection primarily consists of six letters from coffee planter Thomas Leech of Havana, Cuba, to his nephew Charles Jenkins at the plantation at San Marcos, Cuba. The letters pertain largely to the transportation of horses, jugs, ropes, onions, snuff, clothing, coffee, tobacco, and other goods between the city and the plantation. Leech remarks on the low price of coffee, recovering escaped enslaved persons, and business prospects. Two additional letters in the collection are by Joseph Scull, executor of Leech's estate following his death in 1815, to N. B. Boileau in Philadelphia (possibly the family's attorney stateside). Scull's letters shed light on problems that Leech was facing, including a mortgage with Savage & Dugan, insufficient slave labor, and a falling out between Leech and Jenkins.