of the different derivative of the same word, the reference of these three
_Cepa_; _incipio_ and _occupo_, to the Verb _Capio_ may serve for an
instance, if we shall but grant the truth of this principle which the
orientalists have always suppos'd, who form the greatest part of their
words from the sole change of their Vowels.

The same is not altogether allowable in relation to the Consonants, where
we must not admitt indifferently all sorts of changes; the sole affinity of
the Organs is that which must regulate almost all their varieties: the
Labiall letters easily supplant one another but the Dentall or Linguall
with more difficulty succeed them as being not of the same order; For as
these consonants, M. B. P. V. F. make neer the same sound, which is
modified by the divers force of the Air opening the lips after severall
forms. So the Letters D. T. Z. S. ought to make an order by themselves,
having a particular relation to the point of the tongue, which only by
touching upon the teeth in various manners frames their pronunciation.

But it is not a single and easie reflexion, that can absolutely determine
whether two letters have resemblance and proportion, because there are some
of them that being made up of the movements of severall organs, maybe
differently alter'd according to their various resemblances, so the letter
H. carrys not only the resemblance of a gutturall as it is pronounc'd by
the assistance of the muscles of the throat, but also as an Aspiration
besides the regard it hath to the whispers of the tongue, and the 6.
Aspirates of the Lips, Teeth, and Palate. However if the precipitance or
forwardnesse of any, hath by chance brought into use, other methods of
altering sounds, as they have not so certain a foundation in reason, so
neither can they be receiv'd within the Compas of this Art, at least being
not establisht by a regular and constant analogie.