ABSTRACT
I. Isolating languages, in which each word is a monosyllable incapable of receiving any formative affix or of undergoing any internal change for grammatical purposes;
II. Agglutinating languages, in which words that are in themselves immutable are capable of receiving formative affixes; the roots and the grammatical affixes are as it were glued together, hence the name;
III. Flexional languages, in which the fusion of root and grammatical element is much more complete, the root itself being now also capable of undergoing internal changes.
