Book reviews pathology as a 'stepping stone' to under-In discussing placenta duplex, he refers standing disease in terms of biochemistry.to this condition found in many other This plea could be extended to other primates.He believes that the site of 'disciplines' in pathology.There are so implantation may determine whether or many arguments even in this one book not a bilobed placenta arises.In order which demonstrate that the divisions with-to differentiate placenta duplex from a in pathology are too rigid, and interplay placenta with a succenturiate lobe, between the branches needs to be even Professor Torpin suggests that the second- more encouraged as the boundaries be-ary placenta must have a diameter of at come blurred.least half that of the main placenta.He A. G. SIGNY deals in some detail with placenta circum- vallata, a term which has superseded placenta marginata usually ascribed to Kolliker (1870), but, as he rightly points The Human Placenta By R. Torpin.out, was first described by William Hunter.(Pp.xxiv + 190; 55 figures.$11-75).The clinical aspects of the condition are Springfield, Illinois: Charles C. Thomas.discussed, and some theories as to its
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W. J. Hamilton (1970) studied this question.