In any event, the patient quite recovered from her mental symptoms in a month. She was then able to tell us of a previous attack of depression some 12 years previously, namely, at the age of 26. It appears that she had at that time been committed to a hospital for the insane. 1. In this case, in which the diagnosis of manic-depressive psychosis and not paretic neurosyphilis was made, are we sure that the symptoms that we term manic-depressive psychosis were not actually produced by syphilotoxins? In other words, in the absence of spinal fluid signs of inflammation or chemical change, might it not be possible for generalized syphilis outside the nervous system to produce manic-depressive symptoms? There is so far in the literature no experimental or other evidence of syphilotoxins. The existence of products and substances permitting the W. R. and the gold sol reaction is not of course evidence of syphilotoxins. Although there is no evidence of soluble syphilotoxins, it is thought that in the so-called Järisch-Herxheimer reaction (the intensification of clinical symptoms after salvarsan injection) effects may be due to the liberation of products from the killed bodies of spirochetes. Such endotoxins are not here in question. 2. Is visceral syphilis, such as gumma of the liver, able to produce characteristic syphilitic reactions in the spinal fluid? We have had an autopsied case in which there was a “paretic” gold sol reaction of the fluid (though without other signs). The autopsy showed gummata of the liver. However, the finer anatomy of the nervous system showed a mild but definite meningo-encephalitic process, which was doubtless responsible for the gold sol reaction.