1. The authors believe that a reconsideration of some of the results of investigations so far carried out on individual haemoglobins would be salutary. A summary of previous work on their separation and characterization is therefore given, but without detailed discussion,1959
2. The possibility has been;Ager, Lehmann; Vella, 1958b, Benzer,1958
3. Separation.-A minor component (A,) has been separated from normal adult haemoglobin in starch block electrophoresis by Kunkel and co-workers (Kunkel and Wallenius, 1955; Kunkel and Bearn;Kunkel,1957
4. A disorders (Bernasconi, 1956; Marinone and;1958, Marinone;Bernasconi,1957
5. in one pathological case), by Gerald and Diamond (1958a), Masri;et al. (1958), Josephson et al. (1958), and Ceppellini et al,1958