In the article "Hematologic and Genetic Study of the Transmission of Thalassemia (Cooley's Anemia; Mediterranean Anemia)," by Drs. William N. Valentine and James V. Neel, in the September issue (Arch. Int. Med. 74:185, 1944), "1 per cent" in the twelfth line of the third paragraph in the first column on page 189 should read "one parent."