d now. But feasts proper
to a nation, diocese, order, institute or particular church may still be
transferred to a fixed day, if perpetually impeded on their own day.
Another example of necessary changes in that excellent book is in the
last paragraph of page 136 (see Decree S.C.R., June, 1912). The works of
compilers and liturgists need constant revision to keep pace with new
decisions and decrees.

In making commemorations, the order of the commemoration as laid down in
the _Ordo_ should be followed. Elements of a commemoration are the
Antiphon of the _Benedictus_ or the _Magnificat_ with versicle and
response. These antiphons are considered most excellent, preceding as
they do the Gospel canticles (St. Luke I.). The antiphon, versicle and
prayer of the commemoration at an hour should never be repetitions of
others said in the same hour. Thus, if in the office of a confessor
pontiff having the prayer _Da quaesumus_, another confessor pontiff's
feast, commemorated in the same hour, should not have the same prayer.
About the prayer, or, as it is called, the collect, the following should
be noted: first, the commemoration is omitted if the prayer of the
office which is being recited and the prayer of the feast to be
commemorated have the same object. Thus, a feast of the Blessed Virgin,
falling within the octave of the Assumption, should not be commemorated.
Second, where a commemoration for a saint or saints of title similar to
that of the saints whose office is being said, is to be made, the
Congregation of Rites (5th May, 1736) arranged that not even the
versicles and response be repeated and that the following order be
observed:--

IN VESPERS--

1st Com. made by Antiphon and Versicle of Lauds.
2nd Com. made by Antiphon of second Vesper and Ver. of II. Nocturn.
3rd Com. made by Antiphon of I. Noct. and Vers. of III. Nocturn.

IN LAUDS--

1st Com. made by Antiphon and Vers. from first Vesp.
2nd Com. made by Antiphon I. Noct., and Ver., III. Noct.
3rd Com. made by Antiphon II. Vesp., Vers., II. Noct.

If it should happen in commemorating a day within an octave that the
versicle from the common had already been taken for the office, then the
rule is "_Sumenda est in laudibus antiphona de secundis Vesperis; et pro
secundis Vesperis antiphona de laudibus in utroque tamen casu cum v. de
primis Vesperis_" (S.C.R., 18th Dec., 1779). In the above given form
of making commemorations it may be noted that the second comme