[...] the third type of meaningful grammatical arrangement, 'substitution' [...]
- Bloomfield (1935), Pag. 247

In addition to the class-meaning, every substitute has another element of meaning the 'substitution-type', which consists of the conventional circumstances under which the substitution is made.
- Bloomfield (1935), Pag. 247

[...] the substitution-type represents the whole meaning of a substitute [...]
- Bloomfield (1935), Pag. 250

On the whole then, substitution-types consist of elementary features of the situation in which the speech is uttered.
- Bloomfield (1935), Pag. 249

A third great class of grammatical forms must probably be set up for the cases where a form is spoken as the conventional substitute for any one of a whole class of other forms. [...] a third class of grammatical forms. to which we may give the name of 'substitutions'.
- Bloomfield (1935), Pag. 169