 <unk> , a common aspect of 19th @-@ century teaching , is prevalent in many of his works , for example <unk> <unk> in Adventures of a Bachelor and <unk> <unk> in <unk> and Plum , where is shown an almost sexual pleasure in applying punishment . <unk> and humiliation are found in his later work too ; biographer <unk> <unk> described this as Busch 's life @-@ motif . 
