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As Sir John Herbert Parsons says in his foreword, "hitherto there has been no comprehensive monograph in English devoted to the embryology of the human eye." This gap has now been filled by the publication of Dr. Mann's excellent book. In it are considered all stages in the development of the eye and adnexa from the earliest embryonic condition, through fetal and postnatal stages up to maturity. In order to give the reader an insight into the environment in which the first beginnings of the eye appear, the early stages of the embryo are outlined in Chapter I. Then follows a general outline of the development of the optic vesicle and the associated mesoderm in Chapter II. Separate chapters are devoted to the lens, the vitreous and suspensory ligament of the lens, neural ectoderm and its derivatives, the associated mesodermal structures, and the orbit and its contents. In the