m different secretions. Thus the salivary glands
secrete the insipid saliva; the lachrymal glands, the saline tears;
the liver, the yellow, ropy bile; and the kidneys, the acrid urine.

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426. What is said relative to the mucous secretion? 427. Name the
external secretions. 428. Give the office of the follicles. 429. What
appears to be the principal office of the glands? 430. Mention a
secretion produced in a particular emergency.

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430. Some secretions are evidently produced only in particular
emergencies, as is seen in the increased secretion of bony matter when
a limb is broken.

431. When any substance which is not demanded for nutrition, or does
not give nourishment to the system, is imbibed by the lymphatic
vessels, and conveyed into the blood, it is eliminated in the
secretions.

_Illustration._ A few years since, a poor inebriate was carried to a
London hospital in a state of intoxication. He lived but a few hours.
On examining his brain, nearly half a gill of fluid, strongly
impregnated with gin, was found in the cavities of this organ. This
was secreted from the vessels of the brain.

HYGIENE OF THE SECRETORY ORGANS.

432. _Unless the secretions are regularly maintained, disease will be
the ultimate result._ Let the secretions from the skin be suppressed,
and fever or some internal inflammation will follow. If the bile is
impeded, digestion will be impaired. If any other secretion is
suppressed, it will cause a derangement of the various internal
organs.

_Observation._ Ardent spirits derange the secretions, and change the
structure of the brain. This is one reason why inebriates do not
generally live to advanced age.

433. _The quantity of blood influences the character of the
secretions._ If it is lessened to any great extent, the secretions
will be lessened as well as changed in character.

_Illustration._ When a person has lost a considerable quantity of
blood, there is a sensation of thirst in the fauces, attended with a
cold, pale, dry skin. When reaction comes on, the perspiration is
cold, attended with nausea, and sometimes vomiting.

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431. What becomes of those substances imbibed by the lymphatics that
do not give nourishment to the body. 432-437. _Give the hygiene of the
secretory organs._ 432. What effect on the system when the secretions
are not regularly maintained? 433. Does the quantity of blood