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Not only do all those normally circulating in the blood flowing through the injured part promptly stop and begin to scatter themselves through the underbrush and attack the foe at close quarters, but, as has been shown by Cabot's studies in leucocytosis, the moment that the red flag of fever is hoisted, or the inflammation alarm is sounded, the leucocytes come rushing out from their feeding-grounds in the tissue-interspaces, in the lymph-channels, in the great serous cavities, and pour themselves into the blood-stream, like minute-men leaving the plough and thronging the highways leading towards the frontier fortress which has been attacked.
While we had been supposing that the poison was carried, as almost every other known poison is, through the blood-vessels, or lymph-channels, to the heart and thence to the brain, he clearly proved that it ran up the central axis of the nerve-trunks, and consequently, when it had got once fairly started up this channel, was as safe from the attack of any antitoxin merely present in the general circulation and fluids of the body, as the copper of the Atlantic cable is from the eroding action of the sea-water.
As the invading germs pass into the body, they travel most commonly through the lymph-channels and skin; are arrested and threatened with destruction by the so-called lymphatic glands, or lymph-nodes. This is why, if you have a festering wound or boil on your hand or wrist, the "kernels" or lymph-nodes up in your armpit will swell and become painful.
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