No abstract

intervals for at least one month after the evening temperature has reached normal and not only to use the test throughout the febrile period. It is interesting to note that in diseases in which the reaction is rarely found-e.g., in tuberculosis, pneumonia, and diphtheria-a positive result is of still graver omeri than in enteric fever (Ehrlich). In measles in which the reaction is as constant as in typhoid fever no prognostic value attaches to its presence or persistence.S1l'rnmary.-(l) In all but severe attacks the diazo-reaction tends to disappear in the course of the second or third week, this disappearance shortly preceding, or coinciding with, the commencement of lysis ; (2) its reappearance during or after the completion of lysis is a warning of recrudescence or relapse, or of complications directly due to the specific bacillus; (3) a sudden disappearance of the reaction associated with a deterioration of the general condition is of bad omen ; and (4) the character of the reaction is a useful 'check to the history.Tooting.