Incense is used, as is customary at high masses, before the introit,
at the Gospel, after the offertory and during the elevation. Before
the introit the crucifix, the altar[23], the celebrant and the Pope
are successively incensed. Before the deacon sings the gospel he
incenses the book; and after it the Pope is once more incensed by
the first cardinal priest. After the offertory, besides the bread
and wine, the crucifix, the altar, the celebrant and the Pope,
the Cardinals and the first in rank among the prelates and other
personages are incensed by the deacon. At the elevation the blessed
Sacrament alone is incensed.[24]

When the Pope reads from the missal, this book is held by the first,
and a taper by the second, patriarch or assisting bishop[25]. The
_Kyrie eleison_, the _Gloria in excelsis_, _Credo_, _Sanctus_
and _Agnus Dei_ are said by all persons within the sanctuary: the
cardinals descend from their seats to say them, and form a circle in
the middle of the chapel; having received the Pope's blessing they
return to their places. After the _Sanctus_, the Pope goes before
the middle of the altar followed by the assistant bishops and others
of His train's and all kneel till the elevation is ended. After the
_Agnus Dei_, the first Card. priest goes up to the altar, kisses it,
and receives from the celebrant the kiss of peace: this he gives to
the Pope, from whom the two first Card. deacons receive it. The Card.
priest then returns to his place, and gives the kiss of peace to the
priest who assists the celebrant; from him the first of the other
cardinals and principal prelates receive it and communicate it to
their colleagues. The assistant priest then gives it to the master of
ceremonies, who has accompanied him, from whom the other colleges of
prelates receive it and in fine (if time permit) to the deacon, from
whom it passes to others who assist at the altar. When the pope gives