=TABETIC NEUROSYPHILIS (“tabes dorsalis”) with symptoms of cerebral origin producing a picture resembling taboparetic neurosyphilis (“taboparesis”). Autopsy.= =Case 43.= Robert Allen was the fifth case of error in the diagnosis of general paresis analyzed some years since from the staff meeting records of the Danvers Hospital. The Allen case resembles the case of Elizabeth Brown in that there was a combination of tabetic phenomena with cerebral lesions of a non-paretic character at autopsy. But although there seemed to be an utter absence of inflammatory cells (lymphocytosis) in the case of Elizabeth Brown (42), there were some slight perivascular cell accumulations in the Allen case, with a few mononuclear cells suggestive of lymphocytes. The cerebrum, however, failed to show plasmocytosis. It was seriously diseased, showing a marked neuroglia proliferation about the atrophic nerve cells. Robert Allen was a printer coming from a long-lived race. The following are the main facts: Married in 1875 (two children, healthy); again married in 1893 (one child, healthy). Compositor from 1890. In 1898 and 1899 girdle and lancinating pains. Thereafter for several years gait was unsteady. During 1904 and 1905 freedom from pains and improvement in gait but gradually increasing irritability and nervousness. Stopped work on last of March, 1905, owing to sudden increase of irritability, emotionality, boastfulness, expansive schemes, and ataxia. Habits: no tobacco, very little alcohol at long intervals. No drug habits, no sexual irregularity known. Committed to Danvers April 3, 1905, with slight muscular development, poor nutrition, acne, irregular, poorly preserved teeth, gingivitis, flat-foot, slight radial arteriosclerosis, slight arcus senilis, a few hyaline casts, leucocytes, epithelial cells, and trace of albumin in the urine, scar in sulcus, and enlarged inguinal lymph nodes. Ataxic gait, Romberg’s sign, fibrillary twitching of chest, abdominal and facial muscles when standing; right pupil slightly larger than left, pupillary margins irregular, light reactions (electric bulb test) both consensual and direct absent, slight pupillary reaction in accommodation; biceps, triceps and wrist reflexes lively and equal; abdominal, cremasteric and plantar reflexes normal, knee-jerks, Achilles and front taps negative even on reinforcement. The patient himself stated that his ataxia began in 1904, that he had been under treatment for swelling of legs and feet and pain in limbs since 1903, and that there had been some trouble with limbs since 1895. He had been told that his disease was lead-poisoning. About three weeks before commitment patient said he had had an attack of unconsciousness.