Hansen wrote scholarly works on Goethe's Metamorphosis of Plants and had a fierce dipute over this hypothesis with Houston Stewart Chamberlain.
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Despite his shaky status Krogmann, a devotee of the writings of Richard Wagner, Paul de Lagarde and Houston Stewart Chamberlain, was a staunch believer in Nazism, especially its antisemitic aspects and rigorously enforced anti-Jewish laws within Hamburg whilst publicly speaking in support of them elsewhere.
They had 3 children, Basil Hall Chamberlain (1850–1935), a Japanologist, Henry Chamberlain (1853–1923), a lieutenant-commander in the Royal Navy, and Houston Stewart Chamberlain (1855–1927), the natural historian and author (more accurately described in the Oxford Dictionary of National Biography as a "racialist writer").