ELEVEN YEARS have elapsed since Juvenelle and co-workers1reported the first successful reimplantation of the right lung following its removal from a dog. During this period several reports by others2-6on the same subject have appeared in the literature. Although the number of long-term survivors in such series of lung reimplantation in the dog have been relatively few, in those survivors the reimplanted lung has been shown to be functioning adequately as an organ of respiration or, at least, to constitute a significant portion of the total area of hematosis. However, as a result of the attempts to demonstrate long-term survival on the reimplanted lung tissue alone, important questions have arisen which will have an intimate bearing upon the technical aspects of lung homotransplantation when the biological barrier is surmounted. Denervation and interruption of the bronchial arterial supply necessarily follow lung reimplantation or transplantation. The effects on