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Chemical changes, undoubtedly, but what brings about the chemical changes? The body is a colony of living units called cells, that behaves much like a colony of insects when it takes measures to protect itself against its enemies. The body forms anti-toxins when it has to.

The only thing that can be relied upon to kill disease germs within the animal, is a counter-poison developed by the animal itself and known as anti-toxin. Such anti-toxins can be produced artificially and are used to combat certain diseases, as diphtheria and small-pox in human beings and blackleg in cattle.

This ship left another more dread disease, which raged in the islands as a virulent epidemic, instead of running the slow chronic course it does nowadays when all the world has been poisoned by it. The healthy Marquesans had no anti-toxins in their pure blood to overcome the diseases which with us, hardened Europeans and descendants of Europeans, are not deadly.

He absolutely lives for research; it's the one thing he takes an interest in. He practises medicine to make a living, but he devotes every spare minute to hunting for anti-toxins." "Does he indeed? I know my aunt thinks very highly of him, but I'm glad you do, too. Your opinion is worth something." The time passed with amazing quickness, as they discovered when they consulted their watches.

This was a valuable man of science; why, he might yet be awarded the Nobel prize; his discoveries were quite important enough to merit it. Yet she suspected that the idea of fame had never entered his head, he worked for the love of it. He was engaged now in trying to find anti-toxins for certain deadly diseases, tetanus for one.

He had taken his doctor's degree, and was now staying in our town with his father; he was taking a rest, and said that he would soon go back to Petersburg again. He wanted to study anti-toxins against typhus, and, I believe, cholera; he wanted to go abroad to perfect his training, and then to be appointed a professor.