The three letters by André Michaux to his son Francois André shed light on the close relationship between father and son. They are friendly and paternal. There is also an act by the state of New Jersey “to enable Andre Michaux to purchase lands in the State” so that he can establish “a botanical garden…in order to make useful experiments…” (1786). The undated letter by Alexander von Humboldt refers to trees. In 1824, some of André Michaux’s papers were donated to the American Philosophical Society. In a letter (1890) J. M. Le Moine asks Henry Phillips to use Michaux's journal for it describes regions that he himself had also visited.