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The secretion of the mouth in infants is acid, disease increases this acidity; and it has been found that this acid state is not merely favourable to the increase of thrush, but also to the development between the specks of thrush of a sort of membrane formed by a peculiar microscopic growth, of whose existence, just as of that of the phylloxera which destroys the vine, or the muscardine which kills the silkworm, we were ignorant till brought to light by recent scientific research.
You look upon him and see senility on a small scale, but with all its peculiarities: wrinkled skin, apathy, gray hair and all the rest of it. All we can say about it is that it is probably due to a paralysis of all the glands of internal secretion, a removal of their influence upon the cells.
The dietetic habits of a person, for instance, are known to have an influence upon the glands of internal secretion. Meat-eating produces a greater call upon the thyroid than any other form of food. In time this ought to produce a degree of hyperthyroidism in the carniverous populations.
In short, the experiments show "that there is a remarkable accordance in the power of digestion between the gastric juice of animals, with its pepsin and hydrochloric acid, and the secretion of Drosera, with its ferment and acid belonging to the acetic series. We can, therefore, hardly doubt that the ferment in both cases is closely similar, if not identically the same.
The first was a chaste female of twenty-five, who for two years had abundant and spontaneous discharge of milk that wetted the linen; and the other was in a prostitute of twenty, who had never been pregnant, but who had, nevertheless, for several months an abundant secretion of healthy milk. Zoologists know that a nonpregnant bitch may secrete milk in abundance.
That summer their nests were very plentiful; but although the heat might have seemed so favourable to them, the flies were not at all numerous, I mean out-of-doors. Wasps, on the contrary, flourished to an extraordinary degree. One willow tree particularly took their fancy; there was a swarm in the tree for weeks, attracted by some secretion; the boughs and leaves were yellow with wasps.
On this account our irritability to internal stimuli, and our sensibility to pain or pleasure, is not only greater in sleep, but increases as our sleep is prolonged. Whence digestion and secretion are performed better in sleep, than in our waking hours, and our dreams in the morning have greater variety and vivacity, as our sensibility increases, than at night when we first lie down.
Knowing the state of the internal secretion reservoirs enables us to predict the liability to certain of these infections of childhood. Diphtheria has been found to occur most virulently among adrenal poor individuals. Moreover, they are left poorer in adrenal afterwards. It follows that they would be assisted by the feeding of adrenal.
It may be only an alteration of the heart-beats or breathing, or a modification in the distribution of blood, such as blushing or turning pale; or else a secretion of tears, or what not.
A gelatinous material, presumed to be the internal secretion of the gland, has, in fact, been observed emerging from the cells into the blood spaces. The posterior lobe, or gland, consists of secreting cells producing a glassy substance which finds its way into the spinal fluid that bathes the nervous system.
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