. Dr. Evans' How to keep well; . rs are trying to find a way to apply thisinformation, and possibly even these sera, to the cure of cancer in thehuman subject. Eats have leprosy, and it is hoped studies of rat leprosy may help inworking out better cures for human leprosy. Eats also have a rather queer disease known as rat-bite disease. Mostof the reported cases of this disease have come from Japan. Most of thecases reported from this country have come from the Mississippi suggests that rats may be a factor in the spread of sleeping sick-ness—a disease due to a wavy blood parasite
. Dr. Evans' How to keep well; . rs are trying to find a way to apply thisinformation, and possibly even these sera, to the cure of cancer in thehuman subject. Eats have leprosy, and it is hoped studies of rat leprosy may help inworking out better cures for human leprosy. Eats also have a rather queer disease known as rat-bite disease. Mostof the reported cases of this disease have come from Japan. Most of thecases reported from this country have come from the Mississippi suggests that rats may be a factor in the spread of sleeping sick-ness—a disease due to a wavy blood parasite known as trypanosoma. Thesecases were observed before a certain kind of blood parasite had been dis-covered. Probably a parasite of this type is responsible for rat-bite disease. PLAGUE AND THE CANAL Eecently Dr. Howard King of the Tulane University School of Trop-ical Medicine, taking as his text an old Spanish proverb, He is in safequarters who sounds the alarm, told the people of New Orleans and the 296 CONTAGIOUS DISEASES. Fig. 131.—The Human Flea. Mississippi Valley generally of some of the disadvantages of the PanamaCanal. Within a few years traffic will be pouring through the canal—manyof the ships manned by celestials. Much of the traffic will come intoNew Orleans. The most efficient health organization in the world—that ofthe Canal Zone—will have been dissipated. Places now weeks removedfrom the United States will be close at hand, right on the arteries of com-merce. This axiom is everywhere accepted—Disease follows trade. Certaindiseases are best carried by passengers, others by freight; some by railroads,others by steamships. Sailors are proverbially indifferent to rats. Some are superstitious about sailing on a rat- free , plague is frequentlya ship-borne disease. Dr. Kings alarm is basedupon the fact that the canal isgoing to put us in close touchwith some careless people. Inneither Colombia, Ecuador,Peru, nor Chile does thereexist a prop
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