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Abdominal anatomy of the horse shown with examples of gadflies: six figures showing the kidneys, bladder and large intestines of the horse and examples of a mature gadfly, with its larvae and ova. dissections of the heart, lungs, thoracic viscera, pulmonary artery and veins. Engraving by T. Cowan after B. Herring, ca. 1860. Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.