Which of these two was Roehre speaking about?

[Enrique]

There was a time that I semi-seriously defended a stand that music history started after 1905 (von Webern's String quartet on a motto by Jakob Boehme) and reluctantly had to admit that Beethoven (one of my absolute favourites btw) might be an interesting point of departure as well

From Wikipedia:

# Langsamer Satz (Slow Movement) for string quartet (1905)
# String Quartet (1905)

both without opus number. Which of these two works was Roehre referring to? I would like to know. The first work quoted by Wikipedia above is not a quartet but part of one. So logic dictates he was referring to the second.

[Roehre]

STF92,
the 1905 String quartet with the Jakob Boehme motto is usually called String quartet with the M[oldenauer number].78 (playing time between 15 and 19 minutes). It is a full quartet in one movement, and that is the one I mean in connection with Beethoven's opus 135.

The 1905 String quartet without that motto, and most likely conceived as a movement from a bigger work, is quite often -but by no means always- called Langsamer Satz für Streichquartett [slow mvt for string quartet], M.79, (playing time around 10 minutes).

You may come across another movement for string quartet, a Rondo (M.115, 1906), but AFAIK this is always called Rondo für Streichquartett, and -on top of that- it dates from 1906 (playing time around 9 minutes).

[Preston]

Roehre, I just want to say - damn! Damn, you know your stuff! Damn.

[Enrique]

Thank you Roehre for your kind explanation. I'm looking forward to listen to M.78 in view of your remark in the old post, although I do not know if recordings are easy to get. I presume it ought to be more accessible than his later works, when he adhered to the dodecaphonic school. Regards.