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This book consists of the papers and discussions presented at a symposium held in Dundee during September 1964. The five sessions were devoted to (1) the requirements for normal nidation, (2) the influence of drugs on embryogenesis, (3) trophoblast as homograft, (4) the cytogenetics of fetal maldevelopment, and (5) clinical and pathological aspects of abnormal trophoblast—quite an assortment of topics. The theoretical and practical problems dealt with concern the life, survival, and well-being of early conceptuses, though as one discussant admitted, it may sometimes seem that studies of fertility and reproduction are chiefly aimed at reducing the first and interfering with the second. But the recent spate of human plural births attests that contrary efforts are also being made. Seen from whatever angle you please, the early embryo is coming in for an ever bigger share of the attention of many individuals and institutions whose diverse interests otherwise seldom