Parallels in drift in related languages. Phonetic law as illustrated
in the history of certain English and German vowels and consonants.
Regularity of phonetic law. Shifting of sounds without destruction
of phonetic pattern. Difficulty of explaining the nature of phonetic
drifts. Vowel mutation in English and German. Morphological
influence on phonetic change. Analogical levelings to offset
irregularities produced by phonetic laws. New morphological features
due to phonetic change.