Chusan Archipelago.--Storm in a small Boat.--Nearly upset.--Kin-tang, or Silver Island.--Its Inhabitants.--Their Surprise on seeing a Foreigner.--Yang-tse-kiang River.--Its numerous Sand Banks.--Our Schooner aground.--Novel Method of getting Assistance from the Chinese.--Village of Woo-sung.--Opium Station.--Remarks on the Opium Trade.--Its Effects upon the Chinese.