25 Pa. Stat. § 3317
When the number aforesaid shall be completed, the clerk of the House of Representatives shall draw out, one by one, the names of the remaining members of the Senate, and deliver them singly to the Speaker of the House of Representatives, who shall unfold and read them aloud; and the secretary of the Senate shall in like manner draw out the names of the remaining members of the House of Representatives, and deliver them singly to the presiding officer of the Senate, who shall unfold them and read them aloud; and if any unfairness or mistakes shall then be discovered therein, the whole proceedings shall be set aside, and the same shall be renewed in manner and form hereinbefore directed; but after the committee is sworn, no objection for such cause shall be received.
25 P.S. § 3317