McCluskie (1930), Robertson (1930), Francis (1936), and Knowles, Das Gupta and Sen (1936) have noted the occurrence of Spirillum minus in the naturally-infected mouse, Mus musculus. The last-named workers cited an incident in which a wrong diagnosis of rat-bite fever was established on the basis of discovery of spirilla in a white mouse inoculated with the blood of a patient suffering from prol...