Many of my colleagues are doubtless convinced of the truth contained in my title, and would accept the text without the discourse which follows, for it is scarcely possible that my individual experience has been exceptional or that it has not been duplicated by scores of others. Nevertheless, it has seemed to me proper to put my views in concrete form in the hope that there may result a wider realization and discussion of this problem in all its bearings.
The observations of recent years have taught me to respect the common infectious cold as a far from trivial affection and one capable of inflicting serious injuries on its victims. Ever since the initial intensity of the influenza pandemic of 1889-90 waned, we have experienced recurring waves of infectious catarrhal colds which have been spoken of generically as influenza, or grip, or simply as colds. In the absence of laboratory