It may be perceiv'd by the very effects themselves that it will make up a science fully demonstrative, and back't with such consequences, as may very well passe for compleat models in this kind: And above all the scope of its principles infinitely shortens the way without being at all oblig'd to make a descent to a thousand taedious and wearisome differences; which appear much better, and in a more elegant manner in their principles then in themselves, which is an incouragement for me to hope that a Language for the acquest of which we have formerly by a close application numbred severall years, will by this means be made the divertisement of some hours, or at most but some few days. Words being in the opinion of all men but significant sounds, they may be taken either as they are _Natural sounds_, or _arbitrary signs_, I would say, either as they are the proper effect of the motion of our organs, or as the lively representation of the thought of our minds. And since they make their passes from one Language to another they cannot well admit of any alteration in this their transit but in three respects; for whatsoever change be suppos'd it will necessarily fall out, either in the _sounds themselves_ that compose the words, or in _their significations_, or in their _different modifications_, and its from these three distinct regards that the generall principles have their rise, upon which I have fastn'd this new Systime of the Philosophie of the Languages. That I may make my procedure more justificable and artificiall, I examine with all exactnesse the different organs of the voice, the various motions of the muscles belonging to these organs, and the admirable concent and accord of those motions; and these I make use of to demonstratively explaine the precise number of all the simple sounds, that enter into the composition of the Languages, to discover the nature and proper pronunciation of these sounds, and by consequence to disclose their nearnesse and affinity, the resemblances of some, and the disproportion of others, their accord and opposition, their Sympathy and Antipathy, in a word, all their combinations and mixtures, their divisions and distinctions, their orders and severall degrees. From whence I conclude that all the astonishing and surprizing depravations and Corruptions that are met withall in the words that one Language borrows from another, in changing or in transposing, in adding or retrenching, have their basis in nature; which never attempts any thing but to the purpose, and with a sollicitous care, when to us it appears to have acted with an open and observable neglect.