After his death, a number of other books, dictionaries, and grammar manuals in various languages were found in Jefferson's library, suggesting that he studied additional languages beyond those he spoke and wrote well. Among these were books in Italian, Arabic, Irish, Welsh and Dutch.[4] Regarding Spanish, Jefferson told John Quincy Adams that he had learned the language over the course of nineteen days while sailing from the United States to France. He had borrowed a Spanish grammar and a copy of Don Quixote from a friend and read them on the voyage.