[If] the skylights are smaller than a handbreadth and tumah is in the house, whatev-er is directly opposite the skylights remains tahor. [If] the tumah is directly opposite the skylights, the house remains tahor.   [If] tumah is in the house and an item, either susceptible to tumah or not, is placed over either the upper or the lower [skylight], only the lower story becomes tamei. [If] the tumah is directly opposite the skylights and an item susceptible to tu-mah is placed over either the upper or the lower [skylight], everything becomes tamei. [If] an item not susceptible to tumah is placed over either the upper or the lower [skylight], only the lower story becomes tamei.