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The reviewer's first reaction to this guide to parasitology was "Well, why has this inevitable performance not been done before; why has relief not been brought sooner to the long-suffering general practitioner?" For this, in his opinion, is precisely what Blacklock and Southwell have done for those of us who, only occasionally seeing an instance of infestation with those fascinating "animals," have either regarded the subject as a terra incognita or at best have had a confused vision of crawling and creeping things attacking man, pig, cow, snail, fish and insect—a sort of a grand nature-fakery. Nor is the situation much relieved by turning to technical works on parasitology, for there one runs foul at the start of dentigerous ridges, gubernacula, cervical papillae and bursae copulatrices, not to mention plerocercoids and hexacanth embryos. In the present book all these difficulties are swept away and everything is made clear in a