A kind of toccata with sometimes rather pianistic writing (arpeggios passage work). The strong rythm is a bit like Widor's toccata (ti ti ta ta ti ti).
I had hesitations with the tempo as the old edition tells white note = 92 and the most recent tells 63. I found the first one too quick, the second one too slow...and finally played it as I felt, around 80-84 :-)