Our interest in lobectomy and pneumectomy was derived from a desire to remove lobes from dogs in which we had established lung abscesses1 for the purpose of studying the lesion at various stages of development without killing the animal. In a review of the literature on this particular subject, one certain method was chosen which to us seemed to embody correct surgical principles and to which we have added several refinements in technic. The added danger of an abscessed lung with which we were confronted necessarily submitted the method to an unusually severe test in comparison with the experimental work of others in which normal dogs were used. Nevertheless, our results proved highly satisfactory. Lobectomy and pneumectomy received their first scientific experimental investigation in 1881 when Gluck2 removed one entire lung in six dogs and fourteen rabbits. With the exception of two rabbits all of the animals died