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e , ~ ~ ~' I " . - . ~ VII viii SERIES EDITOR'S FOREWORD These stories do not, of course, get us very far in explaining the evolution of tears or anything else, but they do remind us how far the study of beha vioural adaptation has come this century.

In the early years of this century a Scottish doctor speculated on the evolutionary origin of human tears. ' ~ . . . . ~ . . ~ ~ . . . u" . . , ~- . ' _ . . . . . . .