esent to the mind a botanical or geological
excursion, and the saunter will be exchanged for the elastic step, the
inanimate appearance for the bright eye and glowing cheek. The
difference is, simply, that, in the former case, the muscles are
obliged to work without that full nervous impulse so essential to
their energetic action; and that, in the latter, the nervous influence
is in full and harmonious operation.

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195. Give an illustration of mental stimulus cooperating with muscular
activity in the case of the dispirited French army in their retreat
from Russia. How can a union of mental impulse and muscular action be
beneficial to an invalid? Does this same principle apply to those who
labor? 196. Give an instance of the different effects produced by the
absence and presence of the mental stimulus.

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197. It must not, however, be supposed that a walk simply for the sake
of exercise can never be beneficial. Every one, unless prevented by
disease, should consider it a duty to take exercise every day in the
open air; if possible, let it be had in combination with harmonious
mental exhilaration; if not, let a walk, in an erect position, be made
so brisk as to produce rapid respiration and circulation of the blood,
and in a dress that shall not interfere with free motions of the arms
and free expansion of the chest.

_Observation._ The advantages of combining harmonious mental
excitement, with muscular activity, is thus given by Dr. Armstrong:--

"_In whate'er you sweat,
Indulge your taste._ Some love the manly toils
The tennis some, and some the graceful dance;
Others, more hardy, range the purple heath
Or naked stubble, where, from field to field,
The sounding covies urge their lab'ring flight,
Eager amid the rising cloud to pour
The gun's unerring thunder; and there are
Whom still the mead of the green archer charm.
_He chooses best whose labor entertains
His vacant fancy most; the toil you hate
Fatigues you soon, and scarce improves your limbs._"

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197. May not a walk, simply as an exercise, be beneficial? What is
preferred?

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CHAPTER XI.

HYGIENE OF THE MUSCLES, CONTINUED.

198. _The erect attitude lessens the exhaustion of the muscles._ A
person whose posi