《农桑辑要·蚕事预备·变色》
第三次出连，必须等候到午时过后的原因，是害怕第一次先变灰色的蚕子先下蚁。
第三次必须至午时后出连者，恐第一次先变者先生蚁也。
The reason to wait until the afternoon to take out the silkworm eggs for the third time is to prevent the first discoloured silkworm eggs to lay moth before others.