We are constantly reminded that we are in the midst of an explosion of knowledge and information. This is nowhere typified better than in the ever-changing field of pathology. The general consideration of pathology, whether in reference to diseases of the human or diseases of domestic animals, are practically identical.This handbook provides a concise guide to the range of pathological conditions of lungs of sheep, as well as assisting to answer some of the clinical questions we are so often asked. The writer has endeavoured to place every phase of pathology of pneumonia in sheep from the pathological point of view. The entire subject matter has been expressed as far as possible in common everyday language, with the hope that all readers will have no trouble in grasping the pathological facts of pneumonia in sheep.