2. Should the course under treatment cause us to change the diagnosis? It has often been stated that a differential point between cerebrospinal syphilis and general paresis is the reaction to treatment, that is, that a case which recovers could not be general paresis. Head and Fearnsides state that if six months after beginning of treatment the spinal fluid has become negative, the case should be considered as one of cerebrospinal syphilis and not general paresis. We do not feel ready to concur in this view as we know of no similar logic in medicine. We have many cases in which a spinal fluid has remained positive for six months and later become negative, so that where the symptoms shown are those of paretic neurosyphilis, we are inclined to consider the case such until such time as more definite evidence checked by post mortem examination causes us to change this point of view. 3. Do the reflexes change under treatment? The signs of spasticity often do disappear under treatment and also when there is no treatment. A few instances have been reported in the literature where Argyll-Robertson pupils are said to have altered to normal. It has never been our good fortune to see such a change nor have we seen an absent knee-jerk become normal, as has also been reported, except where it is the result of pyramidal tract disease superimposed upon the posterior column sclerosis causing a return of reflex. This, of course, is not to be considered as a return of the normal. (See Case 1.) =Some RESULTS of systematic intravenous salvarsan therapy are PARTIAL (_e.g._, clinical recovery and persistence of positive laboratory tests).= =Case 114.= Walter Henry was an undertaker in a small town. He was married and the father of two healthy children. In May, 1914, he began to lose his appetite. He felt restless and seemed to be losing his grip, and in August he repaired to a sanatorium, where he remained for two months. Shortly after leaving the sanatorium, he fainted one day, while digging a grave, during a spell of great heat. Since that time there had been numerous “weak spells,” with headaches and general debility, insomnia, and loss of weight. In February, 1916, Mr. Henry came to the hospital for advice, but the trip from a distant part of the state was apparently such a strain for him that shortly after admission he collapsed. There were no convulsive movements in this collapse, but the patient was confused and his breathing was rapid and stertorous. The semi-stupor lasted for about 48 hours. Upon recovery from the stupor, Henry was found entirely disoriented, much confused, and laboring under the belief that he was digging a grave. After a time he again fell into a stupor and his temperature rose to 103° F.