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Updated: June 1, 2025
During the last century not a few naturalists observed and described these little vesicles, always regarding them as little spaces and never looking upon them as having any significance in the activities of plants. In one or two instances similar bodies were noticed in animals, although no connection was drawn between them and the cells of plants.
The fore-end of the medullary tube expands into a vesicle and forms the brain, which soon divides into five cerebral vesicles. In the sides of it appear the three higher sense-organs: nose, eyes, and auditory vesicles. No jaws, limbs, or floating bladder. The ancestors of these Amniotes develop an amnion and allantois, and gradually assume the mammal, and finally the specifically human, form.
In this way the central marrow of the Vertebrates divides clearly into its two chief sections, brain and spinal cord. But in these it soon passes away, the one vesicle being divided into several successive parts by transverse constrictions. In all the Craniotes, from the Cyclostoma up to man, the same parts develop from these five original cerebral vesicles, though in very different ways.
This is followed by vesicles or blisters forming on the mucous membrane of the mouth, lips, between and above the claws and the region of the udder. The inflammation of the mouth and feet may be very painful. A smacking or "clucking" sound is produced when the animal moves its jaws and lips.
The mammary glands or udders secrete the milk that nourishes the young. The glands vary in number. Each gland is surmounted by a teat or nipple. The glandular tissue consists of caecal vesicles that form grape-like clusters around the milk tubules.
There are six degrees of burns: Superficial inflammation; formation of vesicles; destruction of superficial layer of skin; destruction of cellular tissue; deep parts charred; carbonization of bones. The larger the area of skin burnt, the more grave is the prognosis. Burns of the abdomen and genital organs are especially dangerous. Young children are specially liable to die after burns.
Will an intense and continuous desire on the part of a young man for sexual intercourse cause a loss of seminal fluid? An intense and continuous desire for sexual intercourse will, without question, cause an active secretion on the part of the testes, an increased secretion on the part of the seminal vesicles and an active secretion on the part of the prostate gland and of Cowper's glands.
Harvey proceeds to contrast this view with that of the "Medici," or followers of Hippocrates and Galen, who, "badly philosophising," imagined that the brain, the heart, and the liver were simultaneously first generated in the form of vesicles; and, at the same time, while expressing his agreement with Aristotle in the principle of epigenesis, he maintains that it is the blood which is the primal generative part, and not, as Aristotle thought, the heart.
Small though these vesicles were when ejected from the volcano, they would become still smaller by bursting when they suddenly reached a much lower pressure of atmosphere at a great height. Some of them, however, owing to tenacity of material and other causes, might have failed to burst and would remain floating in the upper air as perfect microscopic glass balloons.
It was then given me to tell him that perhaps this was a sign that he would soon be received. The angels then told him to cast off his raiment, which, from the ardency of his desire, he did with a quickness that could scarcely be surpassed. By this was represented the character of the desires of those who are in the province to which the seminal vesicles correspond.
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