To the Editor. —On reading the article, "Triiodothyronine (T 3 ) Toxicosis," by the Mayo Clinic group in the October issue ( Arch Intern Med 128 :529-534,1971), I was disappointed not to find reference to the discovery of T 3 by Gross and Pitt-Rivers. 1 Such amenities are too often neglected in our scientific presentations. Next I should like to comment on the paucity of pertinent material in the patient summaries. Four of the six patients treated with radioactive iodine became myxedematous but nowhere is the dose of sodium iodide I 131 administered recorded. Since the report of the Public Health Service Thyrotoxicosis Follow-up Study on thousands of patients treated, it has become clear that myxedema is dose related. There is increasing incidence of hypothyroidism with increased dose. I think it is only fair to expect exact doses of medications prescribed, but in this instance the important information lies in the rad