1. What is the significance of the practically negative tests in this case without clinical improvement? One must believe that the tests became negative as the result of treatment, and that this change in the tests was due to the clearing up of some inflammatory reactions which were present. This may mean that the syphilis had been reduced to inactivity or latency if not cured, or at least that there was no activity sufficient to cause a positive W. R. in the blood serum, whereas whatever activity was present in the brain was in such a region that it did not cause any reacting substances to be cast into the spinal fluid. This would not mean that there would necessarily be any return of function already lost, because this may be considered as a permanent loss which cannot be compensated for. As to these tests, we now feel that the case should remain stationary; that is, that no new symptoms will be added. However, we believe that it is somewhat premature with our present knowledge to make this claim very forcibly, and would rather suggest that this case be considered as demonstrating an interesting fact, the meaning of which can be learned only after a period of years. 2. Why does the gold sol reaction remain strongly positive when all the other tests become negative? As already pointed out, above (Case Martin (117)) there is no known rule about the disappearance of one or other of the abnormal findings in spinal fluid under treatment, and we can at present offer no explanation of this phenomenon. It does, however, illustrate how careful we must be in drawing any conclusions from tests in cases that are being treated. =Diminution in the spinal fluid tests may occur in treated cases of neurosyphilis without clinical improvement.=