北京的中药老店———同仁堂已有“”多年历史。在我国晚清时期’($世纪中叶)，同仁堂由乐印川掌管，他采取了许多特殊做法。当时的北京城，每年都要大挖一次城里的水沟，每次挖沟约需一个月时间。此事本与同仁堂的业务无关，而乐印川却叫人做了一些写上“同仁堂”三字的大红灯笼 Beijing’s traditional Chinese medicine shop --- Tong Ren Tang has “” years of history. During the late Qing dynasty in China (mid-century), Tong Ren Tang was run by Le Yinchuan, and he took many special measures. At that time, the city of Beijing dug up the ditches in the city once a year for about a month. This incident had nothing to do with the business of Tong Ren Tang, but Le Yin Chuan actually made some written on the “Tong Ren Tang” three words of the red lanterns