Soon afterwards (1890), he left for French Indochina in Southeast Asia as a physician for the Messageries Maritimes company, on the Saigon-Manila line and then on the Saigon-Haiphong line.
Tak lama kemudian (1890), ia berangkat ke Indocina Prancis di Asia Tenggara sebagai dokter pada perusahaan Messageries Maritimes, di jalur Saigon-Manila dan kemudian di jalur Saigon-Haiphong.