The papers on tuberculosis contained in the present issue deal with two phases of the subject, one the relation of human to bovine tuberculosis, the other tuberculous infection within the family. Both have important bearing on the general problem of prevention, and can not be too often or too carefully considered so long as there are dubious points needing elucidation.
Pottenger's views, based on clinical observation of the reaction of patients with different forms of tuberculosis to human and bovine tuberculin, lead him to favor the idea that while both human and bovine bacilli may attack man the bovine bacilli gain a foothold with difficulty, probably on account of differences in the soil. Conversely, human bacilli gain a foothold in cattle with difficulty for the same reasons. In other words, while human and bovine bacilli are closely allied subspecies, which probably originated from a common ancestor, each has lived so