“…Thorell and his associates, using a inicrospectrographic method, have studied pathological haenloglobin formation in the leukaemic cells of virus-induced chicken erythroleukaemia. In the affected birds (Ambs and Thorell, 1959), and in a single case of human erythroleukaemia, haernoglobin formation was observed in the cytoplasm of primitive cells not normally forining it, in contrast to human acute leukaemic lymphoblasts and acute myeloleukaemia of the fowl (Cowles, Saikkonen and Thorell, 1958). No pathogenetic connection was stressed, but it is evident that considerable interest attaches to haemoglobin formation in leukaemia.…”