I quoted Fr. Adrian Fortescue in regards to the liturgy because he is an acknowledged expert on it. Enough of an expert that the Catholic Encyclopedia commissioned him to write articles on the liturgy for them. Here is an example of one of his articles:
newadvent.org/cathen/03255c.htm
The Council of Trent merely codified the Mass and allowed liturgies older than 200 years old to remain intact. Thus it is perfectly acceptable to call the Tridentine Mass the Mass of St. Gregory the Great as (as Fr. Adrian Fortescue has stated):
“From roughly the time of St. Gregory [d. 604] we have the text of the Mass, its order and arrangement, as a sacred tradition that no one has ventured to touch except in unimportant details.”
Regarding the canon of the Mass, Cardinal Alfons Sitckler, referring the Council of Trent, has stated:
Secondly, in the old liturgy the Canon is the center of the Mass as sacrifice. According to the testimony of the Council of Trent, the Canon traces itself back to the tradition of the apostles and was substantially complete at the time of Gregory the Great, 600.
latinmassmagazine.com/stickler.asp
I hope I’ll be excused for posting the same thing in two threads. The parts Fr. Fortescue are referring to is, first and foremost the Canon-which is the heart of the Mass. Then the overall structure to which St. Gregory had made changes. Not individual parts and certainly not many of the prayers of the ‘Tridentine’ Mass-he would be too good a scholar to do that.
If one goes through the Tridetine Mass and compares it to the Mass of St. Gregory the Great
-No prayers at the foot of the altar-nothing upto the Introit. The prayer “Aufer a nobis” is ancient (from the Leonine Sacramentary) but there it appears in another capacity not in the Ordinary.
-Kyrie, Gloria, Collect, Epistle, Gospel blessing (the action not the wording) and Gospel as in the time of St. Gregory the Great. However the collects were restricted in number, and the Kyrie may have frequently been a litany on major days and the Gloria was for the bishops only and on certain feasts. Also, all the collects do not date form that time, but the Epistles and Gospels of the Sundays however, do.
-No Creed
No Offertory prayers in whatever capacity.
-The Secret (or the Oratio Super Oblata) followed
The Canon of the Mass as it is, with the preceding prefaces (except that the prefaces were different), and the Memento for the Dead in the Canon being omitted on the greater days.
The Our Father and the embolism to which St. Gregory added the name of St. Andrew. It was said aloud, however.
Pax Domini, the triple signing (with however the Sancta a particle form the earlier Mass) as at the time of St. Gregory. However, at the time of St. Gregory, the kiss of peace comes here-in the TLM it is placed later.
The Agnus Dei was introduced a little later than St. Gregory but consider as from his time. The fraction took place during the singing.
None of the 3 prayers after the Agnus Dei. None of the communion prayers. Instead the Pope communicated, dropped another Particle into the chalice with the prayer “Haec commixtio…” (placed earlier in the TLM) and then said “Pax tecum” before communicating.
No ablution prayers.
The salutation “Dominus vobiscum” and the poastcommunion is the same
Ite Missa est.
No blessing by priest, hwoever the higher clergy blessed the people as they went out.
No Placeat or Last Gospel.
Mr. Davies himself was usually careful in quoting sources, however sometimes his sources were slightly dated and at fault. E.g. the statement also found at the link you provided that says that St. Pius X only made a reform of the Gradual music. The quote is accurate but at the time when that book was written, St. Pius X had only made a reform in the gradual music but later he made others in rankings, etc. which Fr. Fortescue did not fail to note but that was later in an addenum to the book.
I just wanted to point out somethign that was slightly funny thoguh unrelated to the discussion. He quotes the Letter from the Catholic bishops to the Anglicans at the time of the controversy over Orders with regard to drastic changes. While the comment is quite valid regarding the missal of 1970, it is funny because in a retort some years later, the Anglicans (like Dr. J. Legg) hit back at that particular passage by pointing to the breviary rearrangement of St. Pius X.