'Fusional' and 'symbolic' contrast with 'agglutinative,' which is not on a par with 'inflective' at all.
- Sapir (1921), a pag.136

In the isolating languages the syntactic relations are expressed by the position of the words in the sentence. This is also true of many languages of type B, the terms 'agglutinative,' 'fusional,' and 'symbolic' applying in their case merely to the treatment of the derivational, [...]concepts. Such languages could be termed 'agglutinative-isolating,' 'fusional-isolating' and 'symbolic-isolating.'
- Sapir (1921), a pag.139

Such a purely technical classification of languages as the current one into 'isolating', 'agglutinative,' and 'inflective' (read 'fusional') cannot claim to have great value as an entering wedge into the discovery of the intuitional forms of languages.
- Sapir (1921), a pag.144

[...] possibly the contrast between synthetic and analytic or agglutinative and 'inflective' (fusional) is not so fundamental after all.
- Sapir (1921), a pag.145