ve the respiratory nerves. What is said in reference to the
respiratory nerves? 785. Through the agency of what nerves are the
respiratory muscles brought into action? Explain fig. 132.

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786. The fourth, seventh, and tenth pairs of nerves, (7, 8, 9, fig.
132,) with the spinal accessory, phrenic, and external respiratory,
are not only connected with the function of respiration, but
contribute to the expression of the passions and emotions of the
mind.

787. The influence of this order of nerves in the expression of the
passions, is strikingly depicted in Sir Charles Bell's Treatise on the
Nervous System. "In terror," he remarks, "we can readily conceive why
a man stands with his eyes intently fixed on the object of his
fears--the eyebrows elevated, and the eyeballs largely uncovered; or
why, with hesitating and bewildered steps, his eyes are rapidly and
wildly in search of something. In this way, we only perceive the
intense application of his mind to the objects of his apprehension,
and its direct influence on the outward organs."

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Can respiration be suspended for any considerable length of time? 786.
What nerves contribute to the expression of the passions and emotions
of the mind? 787, 788. What does Sir Charles Bell say of the influence
of this order of nerves in the expression of the passions?

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788. "But when we observe him further, there is a spasm in his breast;
he cannot breathe freely; the chest remains elevated, and his
respiration is short and rapid. There is a gasping and convulsive
motion of his lips, a tremor on his hollow cheeks, a gasping and
catching of his throat; his heart knocks at his ribs, while yet there
is no force in the circulation--the lips and cheeks being ashy pale."

789. "These nerves are the instruments of expression, from the smile
upon the infant's cheek, to the last agony of life. It is when the
strong man is subdued by this mysterious influence of soul on body,
and when the passions may be truly said to tear the heart, that we
have the most afflicting picture of human frailty, and the most
unequivocal proof that it is the order of functions we have been
considering, that is thus affected. In the first struggle of the
infant to draw breath, in the man recovering from a state of
suffocation, and in the agony of passion, when the breast labors from
the influence at the heart, the same system of p