It is worn by bishops, priests, deacons and subdeacons under the other eucharistic vestments, either at Mass or at functions connected with it.
All such repasts must have been sacred, but we do not know if they included the Eucharistic rite.
An attempt to hold a public procession of the Host in connexion with the Eucharistic Congress at Westminster in 1908, however, was the signal for the outburst of a considerable amount of opposition, and was eventually abandoned owing to the personal intervention of the prime minister.
It is expressly mentioned by Isidore of Seville as the sixth element in the Eucharistic service, De offic. eccles.
X., and the prayer is nearly the same as that which the teaching of the Apostles assigns for the eucharistic rite.