III. PUZZLES AND ERRORS IN THE DIAGNOSIS OF NEUROSYPHILIS This part of the case collection, dealing with puzzles and errors, is ushered in by six cases (39–44) drawn from a group of errors in diagnosis made some years since at the Danvers Hospital. These six are autopsied cases. Attention is called to the fact that modern methods of diagnosis might have prevented the errors. =DIFFUSE NEUROSYPHILIS (“cerebrospinal syphilis”) versus PARETIC NEUROSYPHILIS (“general paresis”). Autopsy.= =Case 39.= Caroline Davis, dead at 49 years, was a case of error in the diagnosis of general paresis. Like Cases 40 to 44, Case 39 was diagnosticated by the full Danvers staff as a case of general paresis; however, it must be added, before the days of the W. R. and the modern methods of systematic diagnosis. As will transpire in the sequel, there is a large question whether Case 39 is not after all really a case of neurosyphilis, possibly not of the paretic group. The details are as follows: Caroline Davis was a normal school girl till 15, apt in studies, mill worker till marriage at 18; one child, dead (cause unknown). Habits good. Moderate deafness set in in the forties and in 1901 patient became completely deaf in three months’ time. In 1905 she became unable to take care of her house and had a shock in which the right leg was affected. On commitment patient showed good development and nutrition with slight enlargement of capillaries of cheeks, redness and roughening of skin of right ankle. Teeth absent. Slight radial and brachial arteriosclerosis. Urine negative. Sluggish pupil reactions to light both directly and consensually. Deafness absolute, bone conduction defective. Arm reflexes brisk, knee-jerks equal, brisk. Bilateral Babinski reaction more marked on the right side, tremor of tongue, Romberg’s sign, gait defective. Speech stumbling, writing clear, without tremor. Communicated by writing only. Consciousness normal, disorientation for day of month, for place (misnames hospital) and for persons (recognizing nurses, not patients). Patient wrote many letters complaining of pain, headaches and especially of pain in the abdomen and side. The patient was thought to show a slight defect of memory, but her deafness rendered diagnosis difficult. The patient died suddenly on May 23, 1908, shortly after supper, falling backwards, and dying in five minutes with marked respiratory distress. =Post Mortem Findings.= The =cause of death= was not clear. The heart’s blood and cerebrospinal fluid were sterile. There was a small hemorrhage in the anterior part of the right ventricle derived from a small artery of the caudate nucleus. There was about 400 cc. of blood between the dura mater and the pia mater. There was a slight sclerosis of the basal and Sylvian arteries. The brain substance was uniformly softer than normal.