Herbert Allen Giles,
The Civilization of China — Chapter XI—Chinese and Foreigners
“ Almost instantaneously he will hear a loud shout outside, and become aware that the scene is changing rapidly for no very evident reason—only too evident, however, to the surrounding Chinese servants, who know it to be their own custom that so soon as a visitor tastes his "guest-tea," it is a signal that he wishes to leave, and that the interview is at an end. The noise is simply a bawling summons to get ready his sedan-chair, and the scurrying of his coolies to be in their places when wanted. There is another side to this quaint custom, which is often of inestimable advantage to a busy man. ”
