This morning I was visiting someone in the hospital, and as I rode home on the bus I prayed my midday prayer from the 1962 Breviarium Romano-Seraphicum. As far as I can tell we are allowed to do so, and it's a lot smaller and lighter a book to carry around.
In praying from the older breviary, once in a while one gets a shock in coming by one of the psalms or sections of psalms that were expunged from the psalter in the production of the reformed Liturgy of the Hours. Imagine how taken aback I was to suddenly find myself praying the end of psalm 58, which does not appear in the LOH at all:
Laetábitur iustus, cum víderet vindíctam, pedes suos lavábit in sanguine iníqui.
"The just one will rejoice when he sees vengeance, and will wash his feet in the blood of the wicked."
There's a pious thought for one's midday prayer!