《明史·志·卷二十五》
在官左设蚕宫署，令一人，丞二人，挑选内臣中谨慎的人担任。
设蚕宫署于宫左，令一员，丞二员，择内臣谨恪者为之。
To the west of the office a Sericulture Bureau was established with one director and two deputy directors selected from among the careful and responsible eunuchs.