I956 5. The countercurrent-distribution technique has also been used for studies of the action of aqueous HCI on protoporphyrin and its methyl ester. We thank Professor C. Rimington, F.R.S., for his continuous encouragement and support and Miss B. E. Tooth for technical assistance. We are grateful to B. Lewis and Co. for generous supplies of chicken blood. During part of the time that this work was carried out, one of us (J.E.F.) held a Foulerton Research Fellowship of the Royal Society. The Nuffield Unit is supported by a grant from the Nuffield Foundation to Professor C. Rimington.
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