The author considers a number of phases of poliomyelitis. After a brief introduction and historical background, the epidemiology is discussed at some length, not only in regard to local epidemics but also in regard to those of other parts of the world, e. g., Denmark and California. The benign course of the disease in the California epidemic is pointed out as in contrast to the high degree of infectivity. The greater the incidence of poliomyelitis from year to year, the more prevalent the abortive form is apt to be.
Pharyngitis and signs of infection of the respiratory tract are associated with the purely abortive form, which clinically often has no nervous system manifestations. The meningitis of Bang's disease, of Weil's disease, of syphilis and of infectious exanthema, are considered with respect to differential diagnosis. The prognosis of the purely abortive form is good; the temperature falls in three to five