Before anything approaching a thorough and profitable study of the sounds of the American common speech is possible, there must be a careful assembling of the materials, and this, unfortunately, still awaits a phonologist of sufficient enterprise and equipment. Dr. William A. Read, of the State University of Louisiana, has made some excellent examinations of vowel and consonant sounds in the South, Dr. Louise Pound has done capital work of the same sort in the Middle West, and there have been other regional studies of merit. But most of these become misleading by reason of their lack of scope; forms practically universal in the nation are discussed as dialectical variations. This is a central defect in the work of the American Dialect Society, otherwise very industrious and meritorious. It is essaying to study localisms before having first platted the characteristics of the general speech. The dictionaries of Americanisms deal with pronunciation only casually, and often very inaccurately; the remaining literature is meagre and unsatisfactory. Until the matter is gone into at length it will be impossible to discuss any phase of it with exactness. No single investigator can examine the speech of the whole country; for that business a pooling of forces is necessary. But meanwhile it may be of interest to set forth a few provisional ideas.
At the start two streams of influence upon vulgar American pronunciation may be noted, the one an inheritance from the English of the colonists, and the other arising spontaneously within the country, and apparently much colored by immigration. The first influence, it goes without saying, is gradually dying out. Consider, for example, the pronunciation of the diphthong oi. In Middle English it was as in boy, but during the early Modern English period it was assimilated with that of the i in wine, and this usage prevailed at the time of the settlement of America. The colonists thus brought it with them, and at the same time it lodged in Ireland, where it still prevails. But in England, during the pedantic eighteenth century, this i-sound was displaced by the original oi-sound, not by historical research but by mere deduction from the spelling, and the new pronunciation soon extended to the polite speech of America. In the common speech, however, the i-sound persisted, and down to the time of the Civil War it was constantly heard in such words as boil, hoist, oil, join, poison and roil, which thus became bile, hist, ile, jine, pisen and rile. Since then the school-marm has combated it with such vigor that it has begun to disappear, and such forms as pisen, jine, bile and ile are now very seldom heard, save as dialectic variations. But in certain other words, perhaps supported by Irish influence, the i-sound still persists. Chief among them are hoist and roil. An unlearned American, wishing to say that he was enraged, never says that he was roiled, but always that he was riled. Desiring to examine the hoof of his horse, he never orders the animal to hoist but always to hist. In the form of booze-hister the latter is almost in good usage. I have seen booze-hister thus spelled and obviously to be thus pronounced, in an editorial article in the American Issue, organ of the Anti-Saloon League of America.
Various similar misplaced vowels were brought from England by the colonists and have persisted in America, while dying out of good English usage. There is, for example, short i in place of long e, as in critter for creature. Critter is common to almost all the dialects of English, but American has embedded the vowel in a word that is met with nowhere else and has thus become characteristic, to wit, crick for creek. Nor does any other dialect make such extensive use of slick for sleek. Again, there is the substitution of the flat a for the broad a, as in sassy and apple-sass. England has gone back to the broad a, but in America the flat a persists, and many Americans who use sassy every day would scarcely recognize saucy if they heard it. Yet again, there is quoit. Originally, the English pronounced it quate, but now they pronounce the diphthong as in doily. In the United States the quate pronunciation remains. Finally, there is deaf. Its proper pronunciation, in the England that the colonists left, was deef, but it now rhymes with Jeff. That new pronunciation has been adopted by polite American, despite the protests of Noah Webster, but in the common speech the word is still deef.