having a club-foot, is a familiar proof of this.

460. _The blood may be made impure, by the chyle being deficient in
quantity or defective in quality._ This state of the chyle may be
produced by the food being improper in quantity or quality, or by its
being taken in an improper manner, at an improper time, and when the
system is not prepared for it. The remedy for impure blood produced in
any of these ways is to correct the injudicious method of using food.
(See Chapters XV. and XVI.)

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459. How does impure blood affect the brain? What is the effect when
any organ is exerted beyond its powers? What is the effect when an
organ is permanently impaired? 460. How may the blood become impure?

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461. _The blood may also be rendered impure, by not supplying it with
oxygen in the lungs, and by the carbon not being eliminated from the
system through this channel._ The remedy for "impurities of the
blood," produced in this manner, would be, to carefully reduce to
practice the directions in the chapters on the hygiene of the
respiratory organs, relative to the free movements of the ribs and
diaphragm, and the proper ventilation of rooms.

462. _A retention of the waste products of the skin produces impure
blood._ When the vessels of the skin, by which the waste, useless
material is eliminated from the system, have become inactive by
improper and inadequate clothing, or by a want of cleanliness, the
dead, injurious atoms of matter are retained in the circulatory
vessels. The only successful method of purifying the blood and
restoring health when this condition exists, is to observe the
directions given relative to clothing and bathing. (See Chapters
XXXIII. and XXXIV.)

_Observation._ If the blood has become "impure," or "loaded with
humors," (an idea generally prevalent,) it is not and cannot be
"purified" by taking patent pills, powders, drops, &c. But, on the
contrary, by observing the suggestions in the preceding paragraphs,
the blood can be freed of its impurities, and, what is of greater
importance, such "injurious humors" will be prevented.

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461. Mention another means by which the blood may be made impure. How
remedied? 462. What is the effect of want of cleanliness upon the
blood? What is said respecting "humors" in the blood?

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[Illustration: Fig. 88. A front view of the organs within the chest and