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Updated: June 26, 2025
It does not carry oxygen or collect the carbon dioxid as does the blood of higher animals. That work, as we have just seen, is done by the air-tubes. Above the alimentary canal, extending almost the whole length of the abdomen and thorax, is a thin-walled pulsating vessel, the heart.
The hurried breathing which precedes and follows a fit of coughing never entirely subsides, while each returning cough aggravates the irritation and inflammation of the air-tubes, and the child's condition becomes the very dangerous one of hooping-cough complicated with bronchitis.
These able men found their plans thwarted by the indifference of the public, and often by open hostility. "The telephone is little better than a toy," said the Saturday Review; "it amazes ignorant people for a moment, but it is inferior to the well-established system of air-tubes." "What will become of the privacy of life?" asked another London editor.
For the rest, do not trust to appearances, nor imagine that the blood of our friend the cockchafer in reality remains motionless around the air-tubes, idly drinking in the oxygen which is brought to it. Though not flowing in enclosed canals, it is not the less continually displaced by regular currents, which sweep through and renew this apparently stagnant pool.
The pulmonary veins, the left cavities of the heart, and the aorta, are either empty or contain but little blood. The lungs are dark and engorged with blood, and the lining of the air-tubes is bright red in colour. Much bloody froth escapes on cutting into the lungs.
It must of course be borne in mind that measles set in with all the symptoms of a bad cold, followed on the fourth day by the appearance of the eruption; and, moreover, watchfulness must always be alive to detect increase of fever, hurry of breathing, hardness or extreme frequency of cough, the sign of the irritation of the larger air-tubes having extended and become more severe, the evidence that the case from simple catarrh has become one of bronchitis.
It belongs to the class of what has been termed nervous asthma and is observed with special frequency in children who, when younger, had been liable to catarrhal croup; spasm of the air-tubes having taken the place of the previous spasm of the windpipe.
The creaking sound continued, and, mixing with the whizzing of the air-tubes, the grating of the chain, and the roarings and yells of Vanderhoek, made the scene more dismal than it had yet been.
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