The story tells how a microbe of Asiatic cholera enters the veins of John Anderson at the same moment when he is bitten by a rabid dog. The “white, corrugated wall” is the dog’s tooth; the army of dog-faced creatures is composed of the microbes of rabies, or hydrophobia. The vibrant roar heard from time to time, is the beat of the man’s heart. In the veins the cholera microbe finds the red corpuscles and other cells and microbes that exist in the blood, and also the white corpuscles that, according to Metschnikoff, act as destroyers of the microbes of disease. We go with the cholera microbe through the series of blood vessels into the heart and thence back into the arteries and veins, all the time seeing the struggle between the beneficent white corpuscles and the deadly microbes of rabies. We see the desperate efforts to keep the microbes of rabies from entering the cells and finding their way to the brain. As the microbes of rabies reproduce they begin to win the battle. The cholera microbe, himself fighting the hosts of rabies, is about to be overcome, when the physician’s injection of antitoxin brings a new army to fight the dog-faced creatures. Now that the danger of rabies has been overcome attention is paid to the hero of the story, who declares himself to be the microbe of Asiatic cholera. At once the police guardians of the blood, the white corpuscles, close on him and destroy him. Thus John Anderson escapes all danger from rabies and from cholera, to both of which he had been exposed. The battle, if microscopic, had been real, had been on a grand scale, and had been of tremendous importance. The pseudo-scientific story could have no better illustration. Every detail is clear, vivid with action, and tense with interest. There is no turning aside to give scientific information—nothing that is dry-as-dust. The microbes and corpuscles, without losing their essential characteristics, speak and act in ways that we can understand. That is why the story is so successful. It is a human story, based upon human interest. Familiar language, familiar ways of thought, events that we can understand, convey to us information on a learned scientific subject—the work of the white blood corpuscles. Morgan Robertson, 1861-1915, was born in Oswego, N. Y. From 1877 to 1886 he lived the life of a sailor at sea. Gifted with natural literary ability he turned to writing, and wrote a number of distinctly original stories, most of them about the sea, such as _Spun Yarn_, _Masters of Men_, _Shipmates_, and _Down to the Sea_. =Metschnikoff’s theory.= The great Russian physiologist, Iliya Metschnikoff, 1845-1916, taught that the white blood corpuscles act as destroyers of disease microbes.