The tuberculosis officer in order to be able to treat his dispensary patients with adequate knowledge, and in order to advise as to the form of treatment—in a residential institution or not,—most fitted to the patient’s case, must know the sanitary and social circumstances of the patient’s industrial and domiciliary life. He must, therefore, have reports on these circumstances respecting each patient. This raises the general question of the relation of the tuberculosis officer to the medical officer of health. The medical officer of health is officially responsible for controlling the tuberculous patient and his environment from a public health standpoint. As the tuberculosis officer also needs the information acquired in the inquiries which it is the duty of the medical officer of health to make personally or by an authorized agent, coördination of the work of the two officers is evidently required; and this need cause no difficulty when the tuberculosis officer is an officer in the Public Health Department of which the medical officer of health is the chief administrator. _The Home Visitation of Patients_ This is important, (_a_) to inquire into the social circumstances of each patient; (_b_) to instruct him in detail as to the carrying out of instructions for treatment and in the hygiene of his life; (_c_) to make a sanitary survey of the dwelling house, and especially of the patient’s bedroom, and to advise as to any needed reforms; and (_d_) in certain cases to give actual assistance in nursing the patient. The report on these inquiries should be seen by both the medical officer of health and the tuberculosis officer, and on them in conjunction with the tuberculosis officer’s knowledge of the medical condition of the patient, the subsequent course of supervision and treatment will depend. Home visitation can be carried out by nurses attached to the dispensary or by inspectors of the public health department. The latter will usually be more competent in detecting and remedying sanitary defects in the home; the former in encouraging the patient to carry out the needed requirements in personal hygiene and nursing. Many visitors are equally competent in both directions; and as the number of women specially trained in tuberculosis work increases this will more generally be the rule.