A symposium of this title could well have been held in Ancient Greece, but it would then have had the assistance of a philosopher: this it was denied through the indisposition of Professor K. R. Popper, who had hoped to contribute. It could have been held in 1900, but again, the particular subject of anatomical homologue and analogue which might have dominated it then, is not now included. The contributors certainly represent a very much wider cross-section of every field of science than has been the case with any previous volume in this series; if it appeared from the programme of the Conference that the titles of contributions bore little relation to one another, the Conference itself certainly concluded with an appreciation of the diversity of approaches which can be made towards a fundamental feature of science, which is particularly critical to the present state of biology. It is consequently hoped that this volume may serve two purposes: to attract the attention of scientists of all disciplines to the problems which are central in biological investigation and communication and to indicate to biologists the forms of approach made to analogous problems in other sciences; to provide a variety of pathways, one of which may lead the student towards these problems of thought, language and biology.
The Conference was held in Queen's Building, University of Bristol from 6 to 12 September, and owed much to many members of that University for their hospitality; Dr R. B. Clark undertook the arduous duties of Local Secretary. Professor T. Weis-Fogh flew from Copenhagen at extremely short notice to deliver Professor Bohr's Paper.
I am much indebted to contributors and colleagues for their suggestions during the planning of the Symposium, and must particularly acknowledge the help of Professor C. F. A. Pantin and Dr K. E. Machin. Finally, it is a pleasure to record the help and co-operation of the Cambridge University Press in the preparation of the volume.
J. W. L. BEAMENT
Editor of the fourteenth Symposium of the Society for Experimental Biology