The use of tuberculin as a diagnostic measure is becoming more universal as newer and more reliable methods of application have been developed. While this is true of its use in detecting the tuberculous status of patients, its use as a measure of treatment has practically suffered the fate of therapeutic nihilism by specialists in tuberculosis. As tuberculin, both diagnostically and therapeutically, has survived chiefly in the specialty of ophthalmology, it appears timely to present before this section any experience that would support or discredit such a controversial subject.
The breadth of the field which should be covered in order to present the subject at hand in anything like completeness permits only a brief and sketchy presentation without citing the details of the data and experiments by which the present conception and conclusion of the effect of tuberculin have been obtained.
The correlated experiments and opinions of the