or example, the intellectual powers are feeble and inactive.
This arises partly from the inaptitude of a still imperfect brain; but
in proportion as the latter advances toward its mature state, the
mental faculties also become vigorous and active."

770. We are able, in most instances, at least, to trace a correspondence
between the development of the cerebral lobes and the amount of
intelligence possessed by the person. The weight of the brain in man
to that of the whole body varies in different individuals. The
heaviest brain on record was that of Cuvier, which weighed 4 pounds
and 13 1/2 ounces.

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768-772. _Give the physiology of the nervous system._ 768. How is the
brain regarded by physiologists and philosophers? What do they ascribe
to the cerebrum? To the cerebellum? 769. What does the relation
between mental powers and development of brain explain? 770. What is
said respecting the correspondence between the development of the
brain and the amount of intelligence possessed by the person? What is
said of the weight of the brain?

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771. The brain likewise holds an important relation to all the other
organs of the system. To the muscular system it imparts an influence
which induces contraction of the fibres. By this relation they are
brought under the control of the will. To the skin, eye, and ear, it
imparts an influence that gives sensibility, or the power of feeling,
seeing, hearing, &c.

772. Again, the involuntary functions of the different portions of the
system are more or less influenced by the brain. If the action of this
central organ of the nervous system is destroyed, the functions of the
digestive, respiratory, and circulatory apparatuses will be much
disturbed or entirely suppressed.

773. The brain is the seat of _sensation_. It receives the impressions
made on all parts of the body, through the medium of the sensitive
nerves. That the impressions of external objects, made on these
nerves, be communicated to the brain, where sensation is perceived, it
is necessary that they be not diseased or injured.

_Observation._ There is a plain distinction between sensations and
impressions; the latter are the changes produced in the extremities of
the nerve; the former, the changes produced in the brain and
communicated to the mind.

774. What part of the brain receives the impressions or has the most
intimate relation with the intellectual facul