In 1718 was published a new Communion Office taken partly from Primitive Liturgies and partly from the first English Reformed Common Prayer Book,..
The dialect in which this ancient set of liturgies is written is usually known as Umbrian, as it is the only monument we possess of any length of the tongue spoken in the Umbrian district before it was latinized (see Umbria).
It is clear from the evidence of the early Western liturgies that, for at least six centuries, the primitive conception of the nature of the Christian sacrifice remained.
All Eastern liturgies, in their present form, are of later date than the surviving fragments of the earlier Western liturgies, and cannot form the basis of so sure an induction; but they entirely confirm the conclusions to which the Western liturgies lead.
Probably (as Duval suggests) the use of Syriac in these regions went hand in hand with the spread of the monophysite doctrine, for the liturgies and formulas of the Jacobite Church were composed in Syriac. Similarly the spread of Nestorian doctrines throughout the western and southwestern regions of the Persian Empire was accompanied by the ecclesiastical use of a form of Syriac which differed very slightly indeed from that employed farther west by the Jacobites.
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