The delivery of letters is an important way of human communication. The transmission of ancient letters generally has the following ways:
Feather stick: It's a letter with feathers. Yan Shigu's note: "Those who use wooden slips as books are two inches long and need to be recruited. If it is in a hurry, it will be inserted into the bird feathers; There is an urgent need to show speed. " It means that in ancient times, when the war was urgent, feathers were inserted into letters, which was called "feather state".
Feather book: ancient conscription documents.
Chicken feather letter: an ancient feather book, which sticks chicken feathers on letters, so it is also called "chicken feather letter". This method of delivering letters has been used until War of Resistance against Japanese Aggression's time. The Wa, Lahu, Jingpo and other ethnic minorities in southwest China still sent letters in this way until the eve of democratic reform.
Carrier pigeons deliver books: the way of ancient carrier pigeons delivering letters. This way of delivering letters has a long history. Zhang Qian in the Western Han Dynasty and Ban Chao in the Eastern Han Dynasty used homing pigeons to deliver messages to the Western Regions.
Bamboo tube: In ancient times, bamboo tubes were used to deliver letters. From the Tang Dynasty to the Ming and Qing Dynasties, bamboo tubes played a role in protecting and transmitting letters, similar to today's envelopes.
Urgent delivery: a way of transmitting urgent military information in ancient times, commonly known as the "golden list" began in the Song Dynasty and was called "urgent delivery shop" in the Yuan Dynasty. Legend has it that Yue Fei got 12 gold medals from Song Gaozong one day in a row, which made him retreat. This is an urgent delivery from Jinyu brand.