For some letters are formed by closures of
the lips and others by applications of the tongue. But what are the
differences presented by these and what the nature and extent of
such differences, are questions to which answers must be sought from
those who are versed in metrical science. It was necessary that the
two parts which we are discussing should, in conformity with the
requirements, be severally adapted to fulfil the office mentioned
above, and be of appropriate character. Therefore are they made of
flesh, and flesh is softer in man than in any other animal, the reason
for this being that of all animals man has the most delicate sense
of touch.
17
The tongue is placed under the vaulted roof of the mouth. In land
animals it presents but little diversity. But in other animals it is
variable, and this whethe+r we compare them as a class with such as
live on land, or compare their several species with each other. It
is in man that the tongue attains its greatest degree of freedom, of
softness, and of breadth; the object of this being to render it
suitable for its double function. For its softness fits it for the
perception of savours, a sense which is more delicate in man than in
any other animal, softness being most impressionable by touch, of
which sense taste is but a variety.
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