A non-re-respiratory circuit for anesthesia was prepared tentatively for intratracheal anesthesia with halothane and artificial respiration in small birds. Anesthesia was introduced with 4% halothane by the aid of box or mask. Intratracheal anesthesia was performed by the aid of tracheal tube. Mask anesthesia was maintained at a halothane concentration of 2% and an amount of flow of oxygen of 0.3l/min. Most of the halothane gas was discarded before the bird inhaled it. Awaking was allowed to occur by spontaneous respiration after ceasing the evaporation of halothane. In the case of respiratory standstill artificial respiration at a velocity of 50-60 times per minutes could induce spontaneous respiration. These results supported the practicability of the newly devised apparatus.
Fourteen young were born from a sow 2 days after a full gestation period. Of them, ten were stillborn, and four alive, but soon died, showing no abnormal lesions. Pasteurella ureae was isolated purely and abundantly from the lungs, hearts, livers, spleens, and kidneys of 6 young tested. The isolates fermented lactose and not sorbitol. They were resistant to colistin, and sensitive to penicillin, anamycin, chloramphenicol, and thiophenicol.