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. For this reason it is, that every
sanguineous animal has a brain; whereas no bloodless creature has such
an organ, unless indeed it be, as the Poulp, by analogy. For where
there is no blood, there in consequence there is but little heat.
The brain, then, tempers the heat and seething of the heart. In order,
however, that it may not itself be absolutely without heat, but may
have a moderate amount, branches run from both blood-vessels, that
is to say from the great vessel and from what is called the aorta, and
end in the membrane which surrounds the brain; while at the same time,
in order to prevent any injury from the heat, these encompassing
vessels, instead of being few and large, are numerous and small, and
their blood scanty and clear, instead of being abundant and thick.
We can now understand why defluxions have their origin in the head,
and occur whenever the parts about the brain have more than a due
proportion of coldness. For when the nutriment steams upwards
through the blood-vessels, its refuse portion is chilled by the
influence of this region, and forms defluxions of phlegm and serum. We
must suppose, to compare small things with great, that the like
happens here as occurs in the production of showers. For when vapour
steams up from the earth and is carried by the heat into the upper
regions, so soon as it reaches the cold air that is above the earth,
it condenses again into water owing to the refrigeration, and falls
back to the earth as rain
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