In the first place, all physicians, no matter how well they may be trained, are not necessarily good teachers. No matter how keenly aware of the danger of tuberculosis, they are often unable to impress it upon their patients. Again, the busy physician has usually too little time to be a careful teacher. When conscious of a crowded waiting-room, or of the urgency of his next call, he is unable to give any but the most superficial and hurried instructions about the nature of tuberculosis, or the use of the prophylactic supplies. He does not realize that that which is obvious to him is frequently unintelligible to those less enlightened. We have often found patients possessing bundles of prophylactic supplies, given conscientiously enough, but without sufficient instruction to enable them to fold the fillers or to dispose of them afterwards. We recall one such case, where the doctor had given his patient a package of supplies, but had hurried off without opening the bundle or explaining its contents. A week later, we found the package still unopened. The patient, however, had torn a small hole in the wrapper, through which opening he had seen enough to convince himself that the strange objects within were no concern of his. We do not mean to say that no physicians are good teachers, but we do say that even where they are, and are moreover highly conscientious men, that they frequently give inadequate instruction to the patients under their charge, because they are too busy. There is another class of practitioners, who, while willing enough, are nevertheless unable to contribute much towards the anti-tuberculosis campaign. These are the men whose education is limited, who are unable to recognize tuberculosis until it is advanced, and even then hesitate to commit themselves. The patient under these circumstances has ample opportunity to infect others, to say nothing of losing his own life into the bargain. No amount of conscientiousness, of integrity, and of honest intention can compensate for lack of skill. Indeed, many men of this sort come perilously near the border-line of quackery. Yet the State has granted them a licence, though thereby it entrusts them with obligations which they cannot fulfil.