The expense of much of the later phases of the work done on haemoglobin in this country has been borne by the Medical Research Councila department of the Privy Council. How that body came to act "in loco parentis" is worth placing on record. Readers of the book will find that the late Sir WilUam Bayhss was sceptical about the interpretation of much that had been written on haemoglobin; on the initiative of Prof. A. V. Hill an invitation was sent to him to come to Cambridge and sift the points at issue so far as that could be done by discussion. Many points seemed capable of experimental proof or disproof and BayUss conceived the idea of interesting the Department of Scientific and Industrial Research in haemoglobin. The subject fell rather within the sphere of the Medical Research Council who took the matter up and have assisted haemoglobin research both with funds, sympathy and advice ever since. In thanking the Committee I feel that I must also thank the secretary,

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