The patient frequently attitudinized and would remain in an apparently catatonic condition for many minutes. For the most part, she was resistive and mute and non-coöperative as to examination. From time to time, she made impulsive suicidal attempts. So far as a somewhat inadequate =physical examination= was concerned, nothing abnormal could be made out; in particular, the pupils reacted normally to light and were otherwise normal. The routine W. R. of the blood serum, however, returned positive, and in accordance with the policy of the Psychopathic Hospital, the patient was subjected to a lumbar puncture. The lumbar puncture yielded a positive W. R., 109 cells per cmm., a positive globulin and a considerable excess of albumin, and an exceedingly mild gold reaction—syphilitic type. Ten days after admission, the patient had a convulsion. She never regained consciousness, continued to have convulsions for a few hours, and died, apparently from paralysis of respiration. The heart continued to beat for a short period after respiration ceased. The =autopsy= was consistent with the diagnosis which had been rendered after the surprising results of the W. R. in the blood and the laboratory findings in the spinal fluid had been learned. There was a generalized encephalitis with congestion of all the smaller cerebral vessels and petechial areas in the meninges and upon the cortical surfaces. We regard the case as one of syphilitic encephalitis. The brain weighed 1265 grams, indicating a loss of 79 grams by Tigges’ formula (8 times the body length in centimetres). The pia mater was, in the gross, quite normal within the cranium; nor were any cells found in a smear from this pia mater; but the pia mater over the spinal cord was visibly edematous, and a smear from the spinal pia mater showed great numbers of lymphocytes and especially of plasma cells—a finding which was confirmed in stained section, by which a remarkable display of plasma cells was found plastered somewhat generally over the entire pia mater of certain segments. The brain substance was softer than normal, but displayed no differences of consistence. The stripping of the pia mater of the temporal lobes on both sides yielded the so-called “decortication” (that is, the adhesion of small bits of brain substance to the pia mater). The optic nerves were somewhat thinner than normal. No other gross lesions of the brain were found. The dura mater, although dense and injected, was not otherwise abnormal. There was an early visible sclerosis of the middle meningeal arteries, more marked on the left side. The cause of death, so far as the autopsy revealed it, was bronchial pneumonia. There was a diffuse nephritis.