From the study of these cases we see that the process of disease is as uniform as that of health, or of any other process of nature; that certain phenomena constantly take place; that they follow a determinate order; that the events seldom or never vary; that their relations to each other never change; that in these cerebral cases of fever a preternatural fulness and apparently increase in the number of the blood-vessels of the brain and spinal cord, or of their membranes is always present; or that if a case do now and then occur in which even _no_ preternatural vascularity can be discovered such an event is exceedingly rare; that this fulness and increase of the blood-vessels is either identical with, or passes into the state of inflammation; that the state of inflammation, after a certain period, produces results which are known to be effects of inflammatory action in other parts of the body; that these products of inflammation consist of a given number; that the whole of that number never concurs in any one case, but that two or more are frequently found in combination; that the laws by which any one of these is formed rather than any other are at present wholly unknown; while instances do occasionally occur, although they are extremely rare, in which the state of mere vascularity alone subsists without the formation of any inflammatory product that can be discovered. From the study of the history of these same cases we further see that the indications of this inflammatory state of the brain and spinal cord or of their membranes are as uniform as the existence of the state itself; that certain symptoms invariably accompany it; that these symptoms not only declare with absolute certainty that this process is going on, but likewise, in general, clearly mark its progress; and that this series of symptoms and the place in which each stands in the series is as follows: namely,