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MACHINE INTELLIGENCE 8 Machine Representations of Knowledge Machine Intelligence Volumes 1-7 Editor-in-Chief: Donald Michie are all published by Edinburgh University Press and in the United States of America by Halsted Press (a subsidiary of John Wiley & Sons, Inc.) MACHINE INTELLIGENCE 8 New York - London - Sydney - Toronto The publisher's colophon is reproduced from James Gillison's drawing of the ancient Market Cross, Chichester No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical photocopying, recording or otherwise, without prior permission.