Perhaps one of the most remarkable facts presenting itself to the student of medical literature, is the swing of the pendulum, as it may be called, upon almost every topic pertaining to the science. This seems to be especially true concerning those subjects of which we seemed or seem to have more than an average knowledge. Histories of medicine teem with examples. The controversies of pathologists as to the formation of infarcts, the etiology of tumors, the changes taking place in inflammatory processes are familiar instances.
To discuss a subject of somewhat more recent date: if there were one disease upon which we could place our scientific finger and say, "It is," or "It is not," that disease is malarial fever. The intermittents were reveled in by our laboratory savants as mere child's play, while every dabster at the microscope was surprised and delighted at the fields of tertian and