[Footnote 66: This chapel was erected by Paul III according to the
design of Antonio Sangallo. Its two large frescoes are the last
efforts of the genius of Michelangelo, then aged 75 years: they
represent the crucifixion of S. Peter and the conversion of S. Paul.
The fall of Simon Magus, and the baptism conferred by S. Peter,
painted on the righthand-wall are works of Federico Zuccheri; on the
opposite side S. Paul at Malta, and restoring the young man, who had
fallen from a window, are by Lorenzo Sabbatino da Bologna, the ceiling
was painted by Federico Zuccheri. The B. Sacrament is publicly and
solemnly exposed in this chapel for the adoration of the faithful on
the first Sunday of Advent as well as on holy-thursday See Chaltard;
_Descriz. del Vaticano_ Taja, _Palazzo Vaticano_.]

[Footnote 67: S. John Chrysostom established processions at
Constantinople in opposition to those of the Arians; and the empress
Eudoxia supplied the people with silver crosses and wax lights, to be
carried on such occasions. Socrat. Hist. Eccl. lib. VI, c. 8, Sozomen
lib. VIII, c. 8. Processions were incompatible with the persecutions
of the first three centuries. During them, and even long after
Constantine, in consequence of the discipline of secrecy, there was
neither public exposition or procession of the B. Sacrament. The
faithful however adored it privately, as for instance, S. Gregory
Nazianzen relates of his sister Gorgonia, that when seized by a fever
"she fell down with faith before the altar, and invoked with a loud
cry Him who is honoured thereupon". (Discourse on her funeral). S.
Cyril of Jerusalem also exhorts the believer, that when he receives
the chalice of the blood of Christ he should bow down profoundly
and adore. (Catech. 5), The office and mass of Corpus Christi
were composed by S. Thomas Aquinas. As holy-thursday is in great