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So the secretion of saliva, which in young children is copiously produced by irritation, and drops from their mouths, is frequently attended with the agreeable sensation produced by the mastication of tasteful food;, till at length the sight of such food to a hungry person excites into action these salival glands; as is seen in the slavering of hungry dogs.
Though during the mastication of our natural food the salival glands are excited into action by the stimulus on their excretory ducts, and a due quantity of saliva is separated from the blood, and poured into the mouth; yet as this mastication of our food is always attended with a degree of pleasure; and that pleasurable sensation is also connected with our ideas of certain kinds of aliment; it follows, that when these ideas are reproduced, the pleasurable sensation arises along with them, and the salival glands are excited into action, and fill the mouth with saliva from this sensitive association, as is frequently seen in dogs, who slaver at the sight of food.
As the saliva secreted by these glands is most wanted during the mastication of our food, it happens, when the terminations of their ducts in the mouth are stimulated into action, the salival glands themselves are brought into increased action at the same time by association, and separate a greater quantity of their juices from the blood; in the same manner as tears are produced in greater abundance during the stimulus of the vapour of onions, or of any other acrid material in the eye.
That, after having impaired the organ, or weakened its tone, or dried up the salival menstruum, they should need a stimulant, even in the very form of the bane which injures them, is only of a piece with all that has been said of drinking, and especially of dram-drinking, with which latter debauch, the debauch of cigar-smoking has the closest possible alliance.
L. The principal use of Pyrethrum in the present practice is as a masticatory, for promoting the salival flux, and evacuating viscid humours from the head and neighbouring parts: by this means it very generally relieves the tooth-ach, pains of the head, and lethargic complaints.
If any very acrid material be held in the mouth, as the root of pyrethrum, or the leaves of tobacco, the salival glands are stimulated into stronger action than is natural, and thence secrete a much larger quantity of saliva; which is at the same time more viscid than in its natural state; because the lymphatics, that open their mouths into the ducts of the salival glands, and on the membranes, which line the mouth, are likewise stimulated into stronger action, and absorb the more liquid parts of the saliva with greater avidity; and the remainder is left both in greater quantity and more viscid.
The wonderful miracles wrought by Bridget Bostock, of Cheshire, who healed all diseases by prayer, faith, and an embrocation of fasting spittle, induced multitudes to resort to her from all parts of the country, and kept her salival glands in full employ.
More tears are secreted by association with the irritation of the nasal duct of the lacrymal sack, than the puncta lacrymalia can imbibe. Of the gout in the liver and stomach. I. The salival glands drink up a certain fluid from the circumfluent blood, and pour it into the mouth.
It is the admitted maxim, that if smoking is accompanied by spitting, injury results to the smoker; and the reason assigned is, that the salival fluid, which should assist digestion, is in this manner dissipated, and taken from its office. But may not the habitual application of the narcotic influence to the nervous system have its evils also?
We have also a voluntary power over the action of these salival glands, for we can at any time produce a flow of saliva into our mouth, and spit out, or swallow it at will.
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