A few months ago when Dr. C. von Pirquet made known to the medical world his tuberculin skin test much was hoped from it in a diagnostic way, and, indeed, much was promised. Simplicity of detail, practical reliability, and freedom from specific general and focal symptoms were claimed for it. There can be no argument as to the first claim made for this test, but much has been said against its reliability as a diagnostic means in tuberculosis. Regardless of what we had expected of it, or of what had been claimed for it in a diagnostic way by Dr. von Pirquet, it has never been determined definitely as yet just what its true diagnostic reliability is, or will prove to be, in the various forms of tuberculosis.
However, opinions on its diagnostic value may have been at variance, it seems to have been generally conceded by those who