...regulated customs and dues, agreeable of the tariff to be hereafter fixed, such merchandise may be conveyed by Chinese merchants to any province or city in the interior of t be empire of China, on paying a further amount as transit duties, which shall not exceed per cent,...

...Article X of the Treaty of Nanking authorizing goods belonging to British merchants to be conveyed by Chinese merchants to any province or city in the interior of China; Article XI of the Treaty of Tientsin which also opened Swatow and other Southern ports for foreign...