There is at present and has been for the past few months an active epidemic of poliomyelitis in New York City which for richness of clinical variation of multiplicity of development has not been seen for many years. In fact, New York City has not had a severe epidemic of this disease and it is only occasionally that any opportunity has been offered the neurologists and pediatrists of the city to observe the beginning symptoms of this comparatively rare disease.
Coming immediately on the top, as it were, of the epidemic of cerebrospinal meningitis with which New York was afflicted last year, certain factors of etiology and relationship have been prominent in the minds of clinicians which have stimulated research in different lines. So far as the etiology of the present epidemic is concerned, nothing has been revealed, unless the negative evidence be regarded in the light of discovery. A