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Top signed autograph inscription is by the author: “Exemplaire reserve par l’Auteur. F Andre-Michaux 11 Decembre, 1817.” = “This copy is the property of the author.” Michaux was in Philadelphia arranging for the first American edition of this book on that date.
The second one is by the noted book collector Robert C[harles] Winthrop (1809/05/12 – 1894/11/16; Speaker of the U. S. House of Representatives, U.S. Senator, Fellow of the American Academy of Arts and Sciences, President of the Massachusetts Historical Society) dated 1841, the year of his father’s death. With the autograph latin inscription “e libris patris” (“from my father’s library”). His father, Thomas Lindall Winthrop (1760/10/23 – 1841/02/22) died that year. (He graduated from Harvard in 1828, so writing in Latin Was perfectly natural.)