=Diagnosis=: The nystagmus, optic atrophy, and the reflex disorder suggested multiple sclerosis, although the liveliness of the superficial reflexes, especially the abdominal reflexes, was a point somewhat against any advanced degree of multiple sclerosis. It would appear that the absence of pupillary reaction to accommodation is also rather unusual in multiple sclerosis. The serum and spinal fluid W. R.’s proved positive. There were 25 cells per cmm., albumin was in excess, and there was a positive globulin reaction. 1. What is the significance of optic atrophy and other optic changes with respect to neurosyphilis? Canavan, from our laboratory, has reported that she found that 40 of 58 unselected cases of mental disease exhibited obvious and undeniably important changes in the optic nerve. She found that optic nerve changes were even more frequent than chronic spinal cord changes as detectable by the same method (Weigert myelin sheath method); there were only 34 of the 58 cases which showed chronic spinal cord changes. Eighteen cases very probably syphilitic (although the clinical evidence was not in all cases supported by the W. R.) failed to show optic nerve changes in but three instances. The 15 syphilitic cases that did show optic nerve changes showed them in but one eye in three cases, in both eyes in 12 cases. Canavan incidentally demonstrated a spirochetosis in the pial sheath of the optic nerve in a case of neurosyphilis, possibly paretic. 2. What is the frequency of eye changes in neurosyphilis? Posey and Spiller (“The Eye and the Nervous System,” 1906) quote Kéraval as finding 42 instances of fundus change in 51 cases of paresis. Clifford Allbutt found 41 cases of atrophy in 53 of paresis; other authors have found far fewer. Optic atrophy sufficiently marked to cause blindness is relatively rare in paresis. Compare table of eye changes from Joffroy under Case Falvey (55). As for optic atrophy in tabes, Posey and Spiller record statistics as so various as to be on the whole unsatisfactory. The highest percentages found appear to be those of Mott, 80%, and Gross, 88%. It is evident that the standards for measuring optic atrophy must differ very much. =Atypical case of neurosyphilis. Picture of Huntington’s chorea.= =Case 72.= Margaret Green, 28, was received at Danvers State Hospital in an excited and frightened state. She was very talkative and said that she was being bitten by snakes and serpents. She thought every one approaching her was the devil, and sprinkled what she called “holy water” about her for protection. It was clear that she was hallucinated. She heard her child crying, and she saw a woman carrying it away.