3. How shall we explain the absence of ataxia of case Burkhardt when knee-jerks are absent and when, therefore, we are entitled to conclude a certain degree of spinal disease? As stated in connection with case Sullivan (16), the absence of knee-jerks is not a warrant for terming a case—paresis of the tabetic form. The fact is that the lesion in paresis tends to be intraspinal, just as the higher brain lesions tend to occur within the brain substance. The meninges are relatively spared both within the cranium and within the spinal canal. The characteristic degeneration of posterior nerve roots which we find in tabes dorsalis is not necessarily found in general paresis even when there are somewhat extensive spinal lesions. Accordingly the absence of sensory returns by way of the posterior nerve roots which characterizes tabes dorsalis is not necessarily a phenomenon of general paresis. The mechanism by which the knee-jerks are lost depends upon histological detail. They may be lost when under tabetic conditions the posterior roots are severely diseased and when under paretic conditions only intraspinal collaterals or a small portion of fibres are affected. The whole question hinges upon where and to what degree the various reflex arcs are cut in the disease. The tabetic phenomena are, as so commonly stated, intradural; that is, the sensory or gangliospinal neurones at certain levels are affected all the way in from the points at which they pierce the dura mater. The affection of these and other neurones in general paresis is an intraspinal and parenchymatous affection. =Neurosyphilis; auditory hallucinations; ideas of persecution; attacks of excitement. SYPHILITIC PARANOIA (Kraepelin)?= =Case 59.= Bridget Curley was a case that was discharged from the Psychopathic Hospital, recovered, after 26 days in hospital. The symptoms so resembled those of alcoholic hallucinosis that the diagnosis was made despite the fact that the patient consistently denied the use of intoxicants. There was, in fact, no proof that she drank alcohol. The case was, however, not clearly one of alcoholic hallucinosis or of any other well-defined form of mental disease. A provisional diagnosis of manic-depressive psychosis, manic phase, had, in fact, also been made. The illness had begun with depression and inactivity, Bridget’s friends accounted for these conditions on the ground that a lover had departed for Ireland. A few days after the depression began, Bridget became dizzy and refused to give a boarder his breakfast, stating that she had lost her memory and had begun to hear bells ringing and people talking. She then became greatly excited and was brought to hospital, where the prolonged baths quieted her.