It seems, then, a warrantable conclusion that, of the elementary constituents of speech, viz., articulations and vowel sounds, the _articulations_ are, in their own nature, ESSENTIAL, PERMANENT, and PREDOMINANT; the _vowel sounds_, comparatively considered, are ADJUNCTIVE, FLUCTUATING, and SERVILE.
Further, all the vowel sounds that usually occur in speech seem to be uttered with equal ease, in whatever situation they occur, as the same organs are employed for all. In forming the common articulations of speech, as different organs are employed, a degree of difficulty is sometimes felt in making a transition from one articulation to another. { 26} Thus a difficulty will occasionally occur in pronouncing certain words, where the general analogy of inflection or of collocation has brought together articulations which do not easily coalesce. Hence a necessity arises of departing in such a case from the general analogy, and altering or displacing some of those discrepant articulations, for the sake of ease and convenience in pronunciation, and to relieve the ear from an offensive discordant sound. Departures are made from the general rules of speech in the case of the vowel sounds also, of which the Greek tongue abounds with examples. These departures, however, seem to have been made from a desire to indulge the ear in certain national predilections or aversions which it had conceived with regard to particular sounds. In examining the anomalies of speech, or those peculiarities which have been reckoned anomalous, it will be found that such of them as affect the articulations have, for the most part, been adopted for the purpose of ease and convenience in pronunciation; while those which affect the vowel sounds have proceeded from the peculiar taste of the speakers. Thus the former spring from a cause urgent and constant in its nature, and uniform in its operation; the latter, from a cause local and temporary in its nature, and variable in its operation.
If this theory be just, it ought to follow that, in all polished tongues, an agreement will be found among those irregularities which affect the articulations, that is not so observable in those which affect the vowel sounds. There is reason to believe that, if a full comparison were made between different languages, this would accordingly be found to be the case. Let it be observed, then, that in speech a deference has been usually paid to the articulations which has not been paid to the vowel sounds, inasmuch as the latter have been changed from the state in which the structure of each tongue had at first placed them, frequently and from peculiar taste or humour; the former more rarely, and for the most part from necessity. If this observation be found to be well supported, we shall have the sanction of general practice in favour of the conclusion that was formerly { 27} drawn from the nature of articulate sounds, viz., that the articulations are ESSENTIAL, PERMANENT, and PREDOMINANT; the vowel sounds ADJUNCTIVE, FLUCTUATING, and SERVILE.