 Busch did not remain in Frankfurt . Towards the end of the 1860s he alternated between Wiedensahl and Lüthorst , and <unk> where his brother Gustav lived . The association with Johanna Kessler lasted five years , and after his return to Wiedensahl in 1872 they communicated by letter . This contact was interrupted between 1877 and 1891 , after which it was revived with the help of Kessler 's daughters . 
