The microbic or, to speak more exactly, the infectious diseases of the nervous system at present recognized are very few in number and this recognition is, except in the case of hydrophobia, entirely a matter of recent date. Even now, if we except tetanus, rabies, diphtheritic paralysis, cerebro-spinal meningitis, certain forms of neuritis, one or two tropical disorders and the tubercular affections, a spinal infectious etiology is not generally admitted. Perhaps we ought to add tabes and paresis to this list in view of their probable specific origin, and there are one or two affections such asLandry'sparalysis that stand as yet in an undetermined position in this respect. Apart from these forms any infectious nature of diseases of the nervous system is seldom admitted. It is a question, however, whether we may not, in the near future, have to enlarge our ideas to some extent, and put poliomyelitis,