1. Foetal haemoglobin more resstant than adult;denaturation, Alkaine;Kfrber (1866) Kruger (1887) Bischoff; Haurowitz,1926
2. dissociation curve Foetal haemoglobin inside the erythrocyte has a higher oxygen Haurowitz;the Hill equation than adult haemo-McCarthy and Popjik; affinity and smaltler value of 'n' in,1935
3. Definite difference in the solubility curves between human adult and Jope and O'Brien;haemoglobin CO; haemoglobin Q; methamoglobin. In Wyman; Rafferty; Ingalls,1949
4. Jope and O'Brien,1949
5. Spectroscopic differences.. In human foetal haemoglobin the fine 'tryptophanc absorption band';Jope; appears at 289-8-± and in adult haemoglobin,1949