lex," are "non-duplex," "office of nine
lessons."

1. The antiphons are not doubled in a semi-double office.

2. The Sundays of the year, excepting Easter Sunday, Low Sunday,
Pentecost and Trinity, are said according to the semi-double rite. In
the new Breviaries the Psalms for Matins are only nine in number,
instead of the eighteen of the older book.

3. The versicles, antiphons, responses, preces and suffrages of saints,
which are recited in semi-double offices, are given below under their
own titles.

TITLE III.--THE SIMPLE OFFICE.

_Etymology, nature_ and _synonyms_. The word _simple_ comes from the
Latin _simplex_, to indicate the least solemn form of office and it is
the direct opposite in meaning to the term "double." It is synonymous
with the term so often found in liturgical works, the office of
three lessons.

This form of office is of great antiquity, going back to the fifth
century. In the early ages of the Church and down to the fourteenth
century the simple office consisted of the ferial office with lessons,
antiphons and prayers. But in the end of the fourteenth century, simples
came to be celebrated in the same manner as semi-doubles, with nine
lessons and their nocturns, and in case of occurrence were transferred.
As a result the offices of Sunday and the ferial offices were
practically crushed out of the Breviary. The Commission of Reform
applied an easy remedy, by restoring simple feasts to their ancient
place and status. Now, they are not to be transferred; but in case of
occurrence with a feast of higher rite they are merely commemorated.

These feasts have first Vespers only. At Matins, the nine psalms and
three lessons are said as one nocturn. The psalms in semi-double feasts
are from the Psalter under the day of the week on which the feast is
celebrated. "_In quolibet alio Festo duplici etiam major, vel semi
duplici vel simplici et in Feriis Tempore Paschali, semper dicantur
Psalmi, cum antiphonis in omnibus Horis, et versibus ad matutinum, ut in
Psalterio de occurrente hebdomadae die" (Tit, I. sec, 3. Additiones et
Variationes_).

In commemorations in the Office, the versicle, response, antiphon and
collect of a semi-double is made _after_ the following commemorations
(if they should have a place in the recitation of the day).

(1) Any Sunday, (2) a day within the privileged octave of the Epiphany
or Corpus Christi, (3) an octave day, (4) a great double, (5) a lesser
double. Of