Franz Boas,
International Journal of American Linguistics…
“ The unconsciously formed categories found in human speech have not been sufficiently exploited for the investigation of the categories into which the whole range of human experience is forced. Here, again, the clearness of etymological processes in many American languages is a great help to our investigation. The isolation of formal elements and of stems, or of co-ordinate stems, whichever the case may be, is easily performed, and the meaning of every part of an expression is determined much more readily than in the innumerable fossilized forms of Indo-European languages. ”
