3. Bearing in mind that Sullivan was a waiter, what shall be said about the infectivity of these cases? It is counted as a rule as negative, since there are no open spirochete-bearing lesions. The longer the period since infection the less, as a rule, is the chance of contagion in syphilis; and as tabes and paresis occur fairly late in the disease, the infectiousness at this stage is practically negligible. 4. Of what differential value is the insight shown by Sullivan into the nature of his symptoms? Kraepelin remarks that a genuine insight into the nature of the disease does not as a rule occur in paresis. At the beginning of the disease, there may sometimes be a correct understanding of the nature of the disease and of its probable outcome; but the presence or absence of insight into the fact of mental disease is by no means a differential sign of practical value. 5. What is to be said of the occurrence of depression and excited states in paretic neurosyphilis? A variety of classifications of sub-forms of paretic neurosyphilis have been propounded. Kraepelin, for example, deals with four: the demented, depressive, expansive, and agitated forms, but remarks that the division is merely convenient for exposition. The institutional intake does not accurately represent the distribution of cases. Under psychopathic hospital conditions with the relatively easy resort to such institutions, the number of quiet cases increases; under the less advanced conditions in Heidelberg, Kraepelin took in 53% demented paretics as against 56% at Munich (73% women) under the easier conditions of admission. The admissions of demented paretics varied from 37 to 56%. The variations depend much upon the facility with which the cases can be brought to institutions. Where admission is beset with various legal restrictions, the quiet and demented cases are more apt to be treated for long periods at home. The depressive type of paretic neurosyphilis forms a much smaller group, according to Kraepelin, as only about 12% of his Heidelberg admissions were of this type, and still fewer of his Munich admissions. Other authors give percentages as high as 16 and 19. The so-called expansive group is larger, Kraepelin finding 30% of his Heidelberg cases to be of this group, and 21 to 22% of his Munich cases. The rarest sub-form of paretic neurosyphilis is the agitated form: 6% of Kraepelin’s Heidelberg admissions; 14% among males and 5% among females in his Munich admissions, where the diagnosis of agitated paresis was entered on somewhat broader lines. French authors (Sérieux and Ducaste) have enlarged the number of sub-forms of paretic neurosyphilis as follows: Expansive 27%; sensory 24%; demented 24%; persecutory 3%;