The course will comprise histapathological slide sessions sitting around a multi-headed microscope. The students will have time to look at slides on their own, prior to gathering round the multi-head. They will then be expected to describe the tissues and the lesions that they have found and be prepared to forward suggestions as to the impact that the lesions would have had on the host (the pathophysiology) and the possible etiology. Materials will be gleaned from prior routine diagnostic cases.