On high festivals the altar is censed at vespers and lauds.
Pp. 141-142) thus describes the method and extent of the employment of incense at the mass prior to the Reformation: "According to the use of Sarum (and Bangor) the priest, after being himself censed by the deacon, censed the altar before the Introit began.
The middle of the altar was censed, according to Sarum, Bangor and Hereford, before the reading of the Gospel.
In the Sarum and Bangor, the priest censed the oblations after offering them; then the space between himself and the altar.
He was then, at Sarum, censed by the deacon, and an acolyte censed the choir; at Bangor the Sinistrum Cornu of the altar and the relics were censed instead.