nature. Such are the weakness or slowness of understanding, dulness or confusedness of apprehension, incoherency of thought, irregular quickness or heaviness of imagination. Such (to mention no more of this kind) is the want of a ready or retentive memory. Such, in another kind, are those which are commonly, in some measure, consequent upon these; namely, slowness of speech, impropriety of language, ungracefulness of pronunciation; to which one might add a thousand nameless defects, either in conversation