(_b_) Introducing Tb. anti-bodies with the milk in earliest infancy in order to render innocuous any inhaled tubercle bacilli. 40. I have made separate communications regarding feeding with Tb.-free milk. The production of such a milk will be very easy if my method of cattle immunization in practice fulfils the hopes, which I have for it; and these hopes I am convinced are fully justified. 41. In order to produce immunity by means of anti-bodies it is probable that anti-bodies derived elsewhere will have to be added to the milk given to infants. SUGGESTIONS CONCERNING THE HYGIENE OF COW-STABLES AND THE PRODUCTION OF MILK FOR INFANT-FEEDING, WITH SPECIAL REFERENCE TO TUBERCULOSIS. THE BONN RULES. 1. Until it has been definitely decided whether or not my protective cattle inoculation protects cattle against tuberculosis when these are kept in stalls or herds strongly infected with Tb. virus, it should be sought to reduce the danger of infection as much as possible by following Ostertag’s recommendations and segregating all the cattle with an open tuberculosis. 2. The milk of cows which react positively to tuberculin must not be used for feeding calves, nor, of course, for infant-feeding. 3. Whenever the circumstances permit, the separate housing of the protectively inoculated animals in a stable free from tuberculosis is to be recommended. In constructing new stables it is strongly urged that in place of _one large_ stable, several small ones be erected; besides this, attention should be paid to the placing of the animals. They should be placed with the heads toward the lateral walls, and not head to head, facing a common feeding-trough along the middle of the stable.[7] 4. Particular attention should be paid to the cleanliness of the feeding-troughs. Every fourteen days they are to be filled with hot water and freed from any adherent dirt by mechanical means. The feeding-buckets are to be similarly cleansed from time to time. 5. The drinking-water supplied to cattle should meet essentially the same requirements as are demanded of water supplied to dwellings. 6. In maintaining the health of the young cattle an important factor is the pasturage. For larger dairies an arrangement used at our Marburg experimental station, consisting of a lightly constructed shelter within a large enclosed pasture, is to be recommended.