《太平广记·卷四百五十七·蛇二》
郡的城南楼如果出现白烟，刺史不改换就会死去，当地人认为是正常事。
郡城南楼有白烟，刺史不改即死，土人以为常占。
If white smoke appeared in the south tower of the county city, the governor would die if he did not change it. The locals thought it was normal.