Müller's concept of Aryan was later construed to imply a biologically distinct sub-group of humanity, by writers such as Arthur de Gobineau, who argued that the Aryans represented a superior branch of humanity. Müller objected to the mixing of linguistics and anthropology. "These two sciences, the Science of Language and the Science of Man, cannot, at least for the present, be kept too much asunder; [...] I must repeat, what I have said many times before, it would be as wrong to speak of Aryan blood as of dolichocephalic grammar". He restated his opposition to this method in 1888 in his essay "Biographies of words and the home of the Aryas".