I was born too early to have been part of the Drug Culture which you, dear readers, enjoyed so much, but I do know just a bit about addiction.
There is a ... particular passion ... I try to resist it ... which can only be indulged by those who possess a number of old Missals.
It is an addiction to the section of Missals headed Appendix pro aliquibus locis.
This Appendix is at the back of the book. It contains Masses authorised but only for use in particular dioceses or orders.
I have never encountered two missals which have identical versions of the Appendix. The fascination lies in the view you get of the gradual evolution of particular devotions among particular groups. You meet versions of Masses which existed locally before a particular Festival was "extended to the Universal Church". These Mass formulae are not always identical to what later became authorised. Before you know what's happening, you're making notes about changes, similarities, oddities, influences ... hooked, in fact. Just like people high on Thingummy and Whatsit.
I don't recommend getting hooked on the Appendix pro aliquibus locis. As with all addictions, the results are horrible. The addict could find him/herself sweating in bed as the leering, diabolical face of Hannibal Bugnini looms over the fevered couch. Behind him, the waving trunks of mountaineering elephants. The horrible menacing sound of massed Extraordinary Eucharistic Ministers, on heat and endlessly crooning Eat this bread, drink this wine ...
Don't risk it. Instead, I will tell you about my own experiences this morning.
The Appendix I was browsing through dated from before the liturgical observance of the Sacred Heart had became part of the universal worship of the Latin Church. The Mass formula for the places where it had been allowed by indult began with an Introit in which the psalmus was the verse Misericordias Domini in aeternum cantabo. That was natural: time was, when Masses of the Lord's Passion (nearly?) always began thus. In Sarum and the Ordinariate Missal, the Mass of the Five Wounds still begins thus. (I remember a heureka moment in Devon when I realised that the inscription on a carved bench end from the 1490s, which nobody had been able to decipher, began MIASDNI ... misericordias domini in abbrevation.)
But the 1962 Missal gives a different Mass for the Sacred Heart
I wonder why Rome changed the original Mass of the Sacred Heart. Could it be something to do with Jesuits versus Jansenists? Somebody out there will know all about this.
Then I turned the page ... and discovered that the Jesuits were observing, on the Sunday (Pentecost III) after the Sacred Heart, the Feast of the Most Pure Heart of Mary. I believe Rome resisted a number of requests for that Feast in the nineteenth century.
You can see the logic of bringing these two celebrations close together ... the same logic, of course, led the Novus Ordo people in the 1960s to move the Immaculate Heart from August to the Saturday after the Sacred Heart. Conceptual coherence, and all that.
But ... I think it's a good idea. Liturgical dates fixed in the 1940s and 50s by Pius XII do not, in my view, have the same call on our respect as traditional dates ... like Ss Philip and James on May 1.
And when it comes to Jesuits versus Jansenists, I'm a Jesuit!