Episodes that took place aboard the ship to France were noted in his letters, such as his becoming convinced that the Earth was spherical, or the time when he was bewildered because he was asked for a kiss by a young Caucasian boy upon parting from each other.
フランス行きの船内では、地球が球体であることを得心したり、白人少年に別れのキスを求められてとまどうといったエピソードがあったことが本人の手紙にしたためられている。