This case comes before us on appeal from an order of the circuit court of the United States for the Northern district of California, refusing to release the appellant, on a writ of habeas corpus, from his alleged unlawful detention by Capt. Walker, master of the steam-ship Belgic, lying within the harbor of San Francisco. The appellant is a subject of the emperor of China, and a laborer by occupation. He resided at San Francisco, Cal., following his occupation, from some time in 1875 until Ju...