In my article entitled “Studies on Tobacco Hypersensitivity,” appearing in the January, 1933, issue of the Journal of Immunology, the third and fourth paragraphs refer to my suggestions to Dr. Silbert in June, 1931, concerning skin tests with tobacco in thromboangiitis obliterans, and to the experiments which were published about a year and a half later by Harkavy, Hebald and Silbert. My object was simply to report the facts concerning the chronological sequence of events. I realize now that these paragraphs may be susceptible to mis-interpretation. I therefore state that, to the best of my knowledge, Dr. Harkavy may not have known of my previous conversation and arrangement with Dr. Silbert. I feel it only just to affirm that it was not my intention to suggest, either directly or by implication, that Dr. Harkavy, when he commenced his investigations at a later date, knew of my own or any one else's previous interest or ideas in this field, nor did I mean to imply that he did not subsequently conceive and undertake his research independently.