Thursday within the Octave of Pentecost is of semi-double rite.
At the nocturn of Mattins the antiphons, of the feast, are not doubled. The versicle and response before the lessons are proper to the day. The Gospel pericope is from the ninth chapter of St. Luke's Gospel and the homily is from St. Augustine's sixth book on that chapter. At Lauds the antiphons and psalms as sung on the feast are used, but the antiphon on the Benedictus and collect are proper. Commemorations are sung of the Venerable Bede and St. John I.
At the Hours all is as on the feast. The Pentecost Doxology is sung at the conclusion of the hymns, at Terce the hymn is Veni, Creator.
Mass is sung after Terce. Note the difference between the Ember Days. The formulary is proper, Spiritus Domini. The Gloria is sung, the second collect is of the Venerable Bede, the third of St. John. The Sequence is sung, the Creed is sung, the preface, Hanc igitur and communicantes are of Pentecost.
Vespers are as on the feast, but the antiphons are not doubled. The antiphon on the Magnificat is proper. Commemorations are sung of St. Augustine (of Canterbury) and the Venerable Bede.