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Essays on the secretory and the excito-secretory system of nerves in their relations to physiology and pathology : comprising I. A new classification of febrile diseases. II. An exposition of the "ganglionic pathology" of all continued fevers, as illustrated in typhus and typhoid fever. III. The prize essay on the excito-secretory system of nerves in its relations to physiology and pathology. IV. A letter to Dr. Marshall Hall, of London, claiming priority in the discovery and naming of the excito-secretory system of nerves / by Henry Fraser Campbell. Public Domain Mark. Source: Wellcome Collection.