Section 26. (a) Not later than the sixth week preceding any term of grand or trial juror service, the office of jury commissioner may summon additional grand or trial jurors, in the manner provided in sections 19 and 24, if it appears from the responses to the juror summonses that the number of previously summoned jurors who will report for service will be inadequate for the needs of the court. A juror who is summoned under this section shall respond to the juror summons within 10 days of receipt thereof by any of the means set forth in section 24.
(b) Each grand and trial juror summoned under this section from whom the office of jury commissioner has not received a response to the juror summons by the third week preceding the term of service for which the juror was summoned shall be summoned a final time. The final summons shall have the same content and form as the juror summons, except the words ''Final Summons'' shall appear prominently on the face of the summons. The final summons shall be sent by first-class mail, registered mail or served by a sheriff or constable. A juror who receives a final summons shall respond to the final summons within 5 days of receipt thereof by any of the means provided in section 24.