7. In the herbivora the Tb. are most commonly carried from the cæcum to the mesenteric lymph-glands. In man, the agminated lymph-follicles of the small, and the solitary lymph-follicles of the large intestine also serve as points of entry (cf. Carl Hof, “Ueber primäre Darmtuberculose,” Kieler Dissert., 1903. Compare also v. Hansemann, “Ueber Fütterungs Tuberculose,” _Berl. klin. Wochenschr._, 1903, No. 7). 8. Reference to the peculiar features of the stomach of ruminants and remarks on primary tuberculosis of the stomach (Schottelius). 9. The primary development of localized foci in the lesser omentum after infection through the stomach in early nursing period. 10. Peculiarities of the infection of nurslings through the alimentary tract, experimentally and statistically determined. (_a_) Feeding experiments with anthrax bacilli and other bacteria. (_b_) Feeding of spores. (_c_) Tubercular virus behaves in many ways more like the resistant form [spore form] of anthrax virus, especially when the Tb. virus is present in cheesy pus. (_d_) The observations of Adalbert Czerny and Paul Moser on the occurrence of bacteria in the blood of living human nurslings (1894). (_e_) Carl Weigert’s statements concerning the penetrability, for Tb. virus, of the intestinal apparatus of very young children. (From 1883, cited in _Deutsche medizin. Wochenschr._, 1903, No. 41.) (_f_) Raw’s communication (_British Med. Journ._, 1903) concerning 300 cases of _tabes mesenterica_, not one of which was found to have developed in a child nursed exclusively at the breast, but rather in those who had been nourished for a considerable time on cow’s milk. 11. It is probable that in thickly populated countries practically every person is at some time or other infected with tuberculosis. Aside from the quantity and quality of the Tb. virus, the outcome of the tubercular infection is dependent to a high degree on the physiological state of the infected individual and on accidental conditions of infection. (Intercurrent pathological factors; endogenous and exogenous conditions of infection.) 12. Not a single unexceptionable case has been brought forward to show that under the conditions of life usually present in civilized lands, an adult person has ever contracted pulmonary, bronchial, tracheal, or laryngeal tuberculosis without having previously been infected and thus rendered oversensitive to the tubercular poison. 13. Against the action of tubercle bacilli entering the intestinal apparatus, healthy, full-grown persons apparently possess sufficient protection in the character of the mucous surfaces and the anti-bacterial action of the digestive juices. It has, too, still to be proved that healthy, full-grown persons become ill with tuberculosis as a result of eating food (milk, butter, meat) derived from tuberculous cattle.