His best - known students were Christian Rohlfs , Hanns Diehl , and Franz Bunke .
He was head of the art department from 1876 to 1881 , but grew tired of his administrative duties and returned to teaching .
head 's best - known students were Christian Rohlfs , Hanns Diehl , and Franz Bunke .
He was head of the art department from 1876 to 1881 , but grew tired of his administrative duties and returned to teaching .