《太平广记·卷二百四十三·治生（》
唐德宗建中初年，盛夏的六月，京城长安连降大雨，一尺长的一根柴薪价格同平常同样大小的桂木一样。就这样，满街巷没有一车柴薪。
建中初，六月。京城大雨，尺烬重桂，巷无车轮。
Early in the Jianzhong era of Emperor Dezong of the Tang Dynasty, during the height of summer in the sixth month, heavy rain fell continuously in the capital city of Chang'an, and a one-foot-long piece of firewood cost the same as a piece of cassia wood of the same size. Thus, there was not a single cart of firewood on the streets.