《太平广记·卷四百六十八·水族五》
过了一年，王素的女儿有了身孕，到了十二月份，生一个东西象个绢布做的口袋，大小有一升那么大，在地下一动不动。
已而经年，其女有孕，至十二月，生下一物如绢囊，大如升，在地不动。
After a year, Wang Su's daughter became pregnant, and in the twelfth month, she gave birth to something resembling a fabric bag, half a liter in size, laying there on the ground without moving.