I ought to observe, before proceeding further, that what has now been said, is meant to apply only to Diseased Structures, the department of medical science on which alone Dr. Baillie has professed to treat. For it may be remarked, that there are many other pheno mena attending particular diseases, not strictly commg within the province of pathological anatomy, which would enable us still further to view diseases, and class them together'by an artificial arrangement. Some diseases, for example, can be propagated by inoculation.