classification of, [43-46];
pronunciation of, [33], [37-42];
vowel changes, [95-145];
see [Lengthening], [Shortening], [Weakening], [Diphthongs], [Development], [Disappearance], [Hiatus], [Contraction], [Elision], [Assimilation], [Dissimilation], [Gradation], Interchange;
rules of vowel quantity, [35], [36], [2429-2472];
vowel roots, defined, [188];
stem vowel retained before ending, in verbs, [367], [840];
in nouns, [400];
variable, [824-827], [758], [759], [829], [839], [840], [366];