OJ 9/34, [1] Handwritten letter from Cube to Schenker, dated January 21, 1925

Cube has had to extend his holiday to take care of his father, who has been forced to abandon his second marriage under pressure from his firm.

OJ 9/34, [2] Handwritten letter from Cube to Schenker, dated August 14, 1926

Cube is having difficulty getting his father to pay Schenker for lessons given over the previous year, and asks Schenker to write firmly to the latter; speaks of his attempts to make contacts within Düsseldorf artistic circles.

OJ 9/34, [27] Handwritten letter from Cube to Schenker, dated September 8, 1931

Line drawing of Moriz Violin. Cube reports on health of Violin's son; discusses his relationship with Violin, and the prospects of the Schenker Institute in Hamburg; Cube will be assisting at a lecture given by Hans Weisse.