1. Does the “paretic” gold sol reaction mean general paresis? In connection with this general question, a brief summary of the significance of the gold sol reaction in this group may be made. (1) Fluids from cases of general paresis in the vast majority of cases will give a strong and fairly characteristic reaction, especially if more than one sample is tested. (2) Very rarely general paresis fluid will give a reaction weaker than the characteristic one. (3) Fluids from cases of syphilitic involvement of the central nervous system other than general paresis often give a weaker reaction than the paretic, but in a fairly high percentage of cases give the same reaction as the paretics. (4) Non-syphilitic cases may give the same reaction as the paretics; these cases are usually chronic inflammatory conditions of the central nervous system. (5) When a syphilitic fluid does not give the strong “paretic reaction” it is presumptive evidence that the case is not general paresis, and this test offers a very valuable differential diagnostic aid between general paresis, tabes, and cerebrospinal syphilis. (6) The term “syphilitic zone” is a misnomer, as non-syphilitic as well as syphilitic cases give reactions in this zone, but no fluid of a case with syphilitic central nervous system disease has given a reaction out of this zone, so that the finding may be used negatively; and any fluid giving a reaction outside of this zone may be considered non-syphilitic. (7) Mild reactions may occur without any evident significance, while a reaction of no greater strength may mean marked inflammatory reaction. (8) Tuberculous meningitis, brain tumor, and purulent meningitis fluids characteristically, though not invariably, give reactions in higher dilutions than syphilitic fluids. (9) The unsupplemented gold sol test is insufficient evidence on which to make any diagnosis, but used in conjunction with the W. R., chemical and cytological examinations, it offers much information, aiding in the differential diagnosis of general paresis, cerebrospinal syphilis, tabes dorsalis, brain tumor, tuberculous meningitis, and purulent meningitis. (10) We believe that no cerebrospinal fluid examination is complete for clinical purposes without the gold sol test. =FREQUENT SYMPTOMS IN DIFFUSE AND VASCULAR NEUROSYPHILIS= =(“CEREBRAL” AND “CEREBROSPINAL SYPHILIS”)=