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A little further off, the thoracic duct pours its whole contents together into a large vein situated close to the heart, and the blood has no difficulty in recognising and appropriating what belongs to him. Here, my dear little scholar, we conclude the first part of our story.
In the spider, we have a specially constructed antenna; and finally in the centipede a pair of modified thoracic limbs.
It is absolutely inert, except the mandibles, which are still capable of biting. THIRD ACT. The Ammophila clasps the paralysed victim between her legs; with the hooks of her mandibles she seizes the back of its neck, at the base of the first thoracic segment. For nearly ten minutes she munches this weak spot, which lies close to the cerebral nerve-centres.
*To show Changes in the Thoracic Cavity.*—1. The piece at the end should be secured firmly in place by screws or nails. The other should be movable. With this contrivance measure the sideward and forward expansion of a boy’s thorax. Take the diameter first during a complete inspiration and then during a complete expiration, reading the difference. Compare the forward with the sideward expansion.
Other observers discard this theory of M. Gosselin and claim that the rupture is due to direct pressure, as in the cases in which the heart is ruptured without fracture of the ribs. The theory of Gosselin would not explain these cardiac ruptures from external violence on the thoracic walls, and, therefore, was rejected by some.
The Medulla Oblongata is the upper enlarged end of the spinal cord, and from it and the Cerebrum branch forth the Cranial Nerves which reach to various parts of the head, to the organs of special sense, and to some of the thoracic and abdominal organs, and to the organs of respiration. The Spinal Cord, or spinal marrow, fills the spinal canal in the vertebral column, or "backbone."
The organs employed for this purpose, called the respiratory organs, are adapted to handling materials in the gaseous state, and are operated in accordance with principles governing the movements of the atmosphere. By alternately increasing and diminishing the thoracic space, air is made to pass between the outside atmosphere and the interior of the lungs.
Emphysema appeared fifteen minutes after the reception of the wound, and soon became pronounced throughout the front and side of the neck, a little over the edge of the lower jaw, and on the chest two inches below the sternum and one inch below the clavicle. In four hours respiration became very frequent, short, and gasping, the thoracic walls and the abdomen scarcely moving.
Except in forced expirations the ribs are lowered and converged by their own weight and by the elastic reaction of the surrounding parts. *The Diaphragm.*—Another means of varying the thoracic space is found in an organ known as the diaphragm. This is the dome-shaped, movable partition which separates the thoracic cavity from the cavity of the abdomen.
What he taught me lies far down, I doubt not, among the roots of my knowledge, but it does not flower out in any noticeable blossoms, or offer me any very obvious fruits. Where now is the fame of Bouillaud, Professor and Deputy, the Sangrado of his time? Where is the renown of Piorry, percussionist and poet, expert alike in the resonances of the thoracic cavity and those of the rhyming vocabulary?
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