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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Timaeus by Plato: observation that smells must be denser than air, though thinner than water,
because when there is an obstruction to the breathing, air can penetrate,
but not smell.
The affections peculiar to the tongue are of various kinds, and, like many
other affections, are caused by contraction and dilation. Some of them are
produced by rough, others by abstergent, others by inflammatory
substances,--these act upon the testing instruments of the tongue, and
produce a more or less disagreeable sensation, while other particles
congenial to the tongue soften and harmonize them. The instruments of
taste reach from the tongue to the heart. Plato has a lively sense of the
manner in which sensation and motion are communicated from one part of the
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