A is one in which the Host is carried in procession in a monstrance. It is often covered with a canopy and accompanied with candles. At the "litaniae majores" and "minores" and other penitential processions, joyful hymns are not allowed, but the litanies are sung, and, if the length of the procession requires, the penitential and gradual psalms. As to the discipline regarding processions the bishop, according to the Council of Trent (Sess. 25 de reg. cap. 6), appoints and regulates processions and public prayers outside the churches.