Georg Forster
He used insulting words against Poles with prejudice in his letters when he was in Vilnius and in a diary from when he when through Poland. He, however, but he never showed it in his publications. It was only known after he had died when these conversations and diaries were shown to the public. Forster's writings were seen as scientifically based. Forster's prejudice against Poland usually taken as factual in Imperial Germany and Nazi Germany. The "Polnische Wirtschaft" (Polish economy) stereotype was probably because of his letters.