14.  But, whether new languages were thus immediately formed or not, the event, in all probability, laid the foundation for that diversity which subsequently obtained among the languages of the different nations which sprung from the dispersion; and hence it may be regarded as the remote cause of the differences which now exist.  But for the immediate origin of the peculiar characteristical differences which distinguish the various languages now known, we are not able with much certainty to account.  Nor is there even much plausibility in the speculations of those grammarians who have attempted to explain the order and manner in which the declensions, the moods, the tenses, or other leading features of the languages, were first introduced.  They came into use before they could be generally known, and the partial introduction of them could seldom with propriety be made a subject of instruction or record, even if there were letters and learning at hand to do them this honour.  And it is better to be content with ignorance, than to form such conjectures as imply any thing that is absurd or impossible.  For instance:  Neilson’s Theory of the Moods, published in the Classical Journal of 1819, though it exhibits ingenuity and learning, is liable to this strong objection; that it proceeds on the supposition, that the moods of English verbs, and of several other derivative tongues, were invented in a certain order by persons, not speaking a language learned chiefly from their fathers, but uttering a new one as necessity prompted.  But when or where, since the building of Babel, has this ever happened?  That no dates are given, or places mentioned, the reader regrets, but he cannot marvel.

15.  By what successive changes, our words in general, and especially the minor parts of speech, have become what we now find them, and what is their original and proper signification according to their derivation, the etymologist may often show to our entire satisfaction.  Every word must have had its particular origin and history; and he who in such things can explain with certainty what is not commonly known, may do some service to science.  But even here the utility of his curious inquiries may be overrated; and whenever, for the sake of some favourite theory, he ventures into the regions of conjecture, or allows himself to be seduced from the path of practical instruction, his errors are obstinate, and his guidance is peculiarly deceptive.  Men fond of such speculations, and able to support them with some show of learning, have done more to unsettle the science of grammar, and to divert ingenious teachers from the best methods of instruction, than all other visionaries put together.  Etymological inquiries are important, and I do not mean to censure or discourage them, merely as such; but the folly of supposing that in our language words must needs be of the same class, or part of speech, as that to which they may be traced in an other, deserves to be rebuked.  The words the and an may be articles in English, though obviously traceable to something else in Saxon; and a learned man may, in my opinion, be better employed, than in contending that if, though, and although, are not conjunctions, but verbs!