London, Eng., May 1, 1899.
To the Editor:
—This is a subject, allusions to which are frequent in medical literature. These, however, are essentially of the vaguest and most academic character and the general impression to be gained from them is that such a disease exists much more commonly than we usually suspect, and is frequently mistaken for genuine tuberculosis. These impressions were, however, completely dissipated by the interesting discussion which recently occupied two successive sessions of the London Pathological Society. In the first place it was shown that there is no such single or distinct disease, but that the name applies to a number of conditions which agree only in one respect, that they imitate more or less completely the anatomic picture of tubercle postmortem; clinically, there is little or no resemblance whatever between themselves, or to the "genuine" form. This "anatomic tubercle" may be due to a number