That's right up there with the Carmen variations for fun material. I never encountered it, but knew of it, the Gliere theme is quite characteristic, and Lewenthal's name precedes him as always. Very interesting/entertaining. There's a different version of it?
I love Siloti! There are quite a few scores on IMSLP but unfortunately a lot of them are still owned by the Siloti estate/family/descendants for god knows why. Why haven't they released his unpublished manuscripts? people are annoying.