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P R E F A C E

The 4th International Photobiology Congress, under the auspices of the Comité International de Photobiologie, and organized by a com- mittee set up by the British Photobiology Group, was held in Oxford,

26-30

July

1964.

Over

500

members, from

29

countries, attended and 234 papers were presented. The proceedings comprised Rap- porteur Sessions with Introductory Lectures, Sectional Meetings and Symposia. The papers presented will be submitted by their authors to appropriate scientific journals ; this volume is a record of the lectures, reports and discussions representing the co-operative activities of the Congress. The subject, a wide one, as will be appreciated from a study of the contents of this volume, is at present in a stage of rapid development, particularly in the interpretation of observed facts in terms of biological structures, chemical changes and molecular energy levels, and the aim of the Congress was to assist in the uni- fication of the many branches of photobiological research. Every effort has been made to reproduce as accurately as possible what the various contributors intended to convey, and the Editor must be held responsible for errors and inaccuracies. Some degree of uniformity of nomenclature has been attempted ; wavelengths are given in units of nm ( = i o ~9 meter = ι τημ = ίο A), and various terms describing the spectral region below 400 nm have been replaced by the symbol u.v.

The arrangements for the Congress were in the hands of the Secretaries, Dr Daphne Vince and Dr H. J. A. Dartnall, the Treasurer, Dr S.Y.Thompson, and Mr C.F. Seath, assisted by Mrs E . M . Lewis.

The help and advice given by Dr Edna Roe, Secretary General of the C L P . , must also be acknowledged.

E . J. B O W E N University College, Oxford

vii

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