The tendency of infectious diseases to exhibit themselves in certain well-differentiated forms or types is perhaps particularly well seen in cerebrospinal fever. So true is this that although the complex of symptoms is exceedingly characteristic in the cases of average severity, the variations on the one hand to the malignant form, or, on the other, to the extremely mild or the abortive type are so great that the diagnosis may be rendered very difficult.
The title "Cerebrospinal Fever" has been chosen advisedly instead of cerebrospinal meningitis, because I have in mind here the disease which appears to be a specific infectious one, coming generally in epidemics, and having a certain definite though varying group of symptoms. It is by no means certain that this affection differs in any way from cerebrospinal meningitis not of an epidemic nature. From this latter point of view the cases are, of course, very much