《太平广记·卷四百七十七·昆虫五》
工部员外郎张周封说，百合花用盒子装起来，用泥把缝隙抹严，经过一宿，就变成了大蝴蝶。
工部员外郎张周封言，百合花合之，泥其隙，经宿，化为大蝴蝶。
The deputy head of the Ministry of Works, Zhang Zhoufeng, said that if lilies are sealed in a box overnight with all its openings blocked with mud, they will transform into large butterflies.