Ferias.

Text is taken from The Saint Andrew Daily Missal,
unless stated otherwise.

Ferias are Week-Days on which no Feast of a Saint is kept.

Ember Days (which are Ferias), Rogation Days (which are Ferias), and every Feria in Lent, have a special Mass.

On other Ferias, The Mass of the preceding Sunday is said.

Some Ferias are called Greater Ferias, and are divided into two Classes:

a.   Privileged Ferias.

      These are:

      Ash Wednesday;
      The First Three Days of Holy Week.

      These Ferias do not give place to a Feast.

b.   Non-Privileged Ferias.

      These are:

      Ferias of Advent;
      Ferias of Lent;
      The Ember Days;
      The Monday of Rogation Week.

      A Commemoration of Non-Privileged Ferias is always made on Feast Days.
      Non-Privileged Feria's Gospels are The Last Gospel at Feast Day Masses.

On the Ferias of:

Lent (after Ash Wednesday);
and those in Passiontide (before Palm Sunday);
and The Ember Days (not those in Pentecost Week);
and on Monday of Rogation Week;
and on Ordinary Vigils;

      if a Greater-Double Feast,
      Double Feast,
      or,
      Semi-Double Feast,
      is kept,

      it is allowed in Private Masses to say The Mass of The Feria, or of The Vigil,
      with a Commemoration of The Feast,

or,

      it is allowed in Private Masses to say The Mass of The Feast,
      with a Commemoration and Last Gospel of The Feria or The Vigil.