body is accompanied by kataboly. The medium by which these
katabolic changes are set going and controlled is the nervous
system. The nervous system holds the whole body together in one
harmonious whole; it is the governing organization of the multicellular
community (Section 55), and the supreme head of the government
resides in the brain, and is called the mind. But just as in a political
state only the most important and most exceptional duties are
performed by the imperial body, and minor matters and questions of
routine are referred to boards and local authorities, so the mind
takes cognisance only of a few of the higher concerns of the animal,
and a large amount of the work of the nervous system goes on
insensibly, in a perfectly automatic way-- even much that occurs in
the brain.