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The paperback edition of the book is sold subject to the condition that it shall not, by way of trade or otherwise, be lent, resold, hired out, or otherwise circulated without the publisher's prior consent in any form of binding or cover other than that in which it is published and without a similar condition including this condition being imposed on the subsequent purchaser.

Many two-variety competition experiments have plants of the two varieties systematically arranged on a triangular lattice of hill plots . Designs, balanced in a certain sense, are introduced and their advantages explained. An example of such a design is presented and compared with one of a more conventional nature.