68.
12.

From his own positive language, I imagine this ingenious author never well considered what constitutes the sameness of words, or wherein lies the difference of the parts of speech; and, without understanding these things, a grammarian cannot but fall into errors, unless he will follow somebody that knows them.

But Tooke confessedly contradicts, and outfaces "_all other Grammarians_" in the passage just cited.

Yet it is plain, that the whole science of grammar--or at least the whole of etymology and syntax, which are its two principal parts--is based upon a division of words into the parts of speech; a division which necessarily refers, in many instances, the same words to different sections according to the manner in which they are used.

"Certains mots repondent, ainsi au meme temps, a diverses parties d'oraison selon que la grammaire les emploie diversement."-- _Buffier_, Art.150.