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The first thoracic segment is a little longer than the rest, with the dorsal plate very slightly tinged with russet, as is the top of the head. Beginning with the tenth segment, the body tapers a little. A slight scalloped rim divides the dorsal from the ventral surface. The legs are short, white and transparent and end in a feeble claw.
"I expect that when you first began to go round the wards, you doubted whether you were cut out for medical practice. I did. For special work one needs special knowledge and an acquired faculty for making use of it. What does a second year's student make of a small thoracic aneurysm?
Yet we find in many fishes the pair of fins, which correspond to the hinder limbs of other animals, placed so far forwards as to be either on the same level with, or actually in front of, the normally anterior pair of limbs; and such fishes are from this circumstance called "thoracic," or "jugular" fishes respectively, as the weaver fishes and the cod.
But when the world changes again, and on the upper plane we realize the wonder of other things, the difference is almost shattering. The thoracic ganglion is a ganglion of power. When the child in its delicate bliss seeks the mother and finds her and is added on to her, then it fulfills itself in the great upper sympathetic mode. But then it relinquishes her. It ceases to be aware of her.
Complete penetration or transfixion of the thoracic cavity is not necessarily fatal, and some marvelous instances of recovery after injuries of this nature, are recorded. Eve remarks that General Shields was shot through the body by a discharge of a cannon at Cerro Gordo, and was given up as certain to die. The General himself thought it was grape-shot that traversed his chest.
Bausch mentions a case in which the omentum, stomach, and pancreas were found in the thoracic cavity, having protruded through an extensive opening in the diaphragm. Muys, Bonnet, Blancard, Schenck, Sennert, Fantoni, and Godefroy record instances in which, after rupture of the diaphragm, the viscera have been found in the thorax; there are many modern cases on record.
It is only recent science which has completely shown the perfectness of this minute symbol of the power of Athena; proving that the insect's flight and breath are co-ordinated; that its wings are actually forcing-pumps, of which the stroke compels the thoracic respiration; and that it thus breathes and flies simultaneously by the action of the same muscles, so that respiration is carried on most vigorously during flight, "while the air-vessels, supplied by many pairs of lungs instead of one, traverse the organs of flight in far greater numbers than the capillary blood-vessels of our own system, and give enormous and untiring muscular power, a rapidity of action measured by thousands of strokes in the minute, and an endurance, by miles and hours of flight."*
Pair of swimming feet with their broad basal joints, whose serrated edges serve the office of maxillae. h. Thoracic plate covering the first two thoracic segments, which are indicated by the figures 1, 2, and a dotted line. 1-6. Thoracic segments. 7-12. Abdominal segments. 13.
Poulet remarks that Vigla has collected the most interesting of these cases of migration of foreign bodies. Hevin mentions several cases of grains of wheat abstracted from abscesses of the thoracic parietes, from thirteen to fifteen days after ingestion. Bonnet and Helmontius have reported similar facts.
This is one of those fatal mis-growths that show the great part that blind chance has in organic development. Transverse section of the head of a chick-embryo, thirty-six hours old. Thus the thoracic cavity of the mammals, with its important contents, the heart and lungs, belongs originally to the HEAD-PART of the vertebrate body, and its inclusion in the trunk is secondary.
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