In these acute forms of the disease, if the proper remedies be not vigorously employed, the pain ceases _within the fourth day_; it rarely extends beyond the fifth; the pain passes into insensibility; delirium comes on, sometimes so violent as to require restraint, but delirium is by no means an invariable concomitant of the other symptoms, even when these are the most violent: when it is present it is almost always rapidly followed by muscular tremors, and these by subsultus tendinum, which now and then usher in general convulsions; but this last event is rare, and I have never yet seen convulsions unaccompanied with a particular condition of the brain hereafter to be described. Sometimes the muscular tremors succeed immediately to the transition of the pain into insensibility, while the insensibility rapidly increases to stupor, and that to profound coma. The breathing is occasionally as stertorous as it is in apoplexy, but this is also rare, and when it does occur, is probably dependent on a peculiar condition of the brain hereafter to be pointed out. Together with these there is a concurrence of a greater or a lesser number of the symptoms enumerated at page 107, but the particular combinations that are found most usually to accompany particular conditions of the brain, it will be most instructive to state in connexion with the pathology. In synochus with acute cerebral disease there is less indication of thoracic and abdominal affection than in the subacute form, because the intensity of the cerebral disease obscures the signs of derangement in the other organs; but the signs of their derangement are never absent, although they are less obtrusive, and they trace in indelible characters proofs of their activity in the ravages they commit upon their structures in which they have their seat. Such is the course of synochus under different degrees of violence. When it is combined with subacute cerebral affection, that course is usually terminated in from three to six weeks; when with acute cerebral affection, in from seven to ten days. As an illustration of each form of the disease, as it is commonly met with in practice, I subjoin the following cases. CASE I. JOHN COLEBERT, æt. 28, admitted into the Fever Hospital August 1, 1828. Attacked five days ago with chilliness, alternating with heat, pains of limbs, head-ache, and sense of weakness. At present complains of pain of head, with slight giddiness; pains of limbs, especially of back and lower extremities; skin moderately warm; tongue loaded with white fur; much thirst; three stools; respiration natural; no cough, no uneasiness in chest; no epigastric or abdominal tenderness on full pressure; pulse 96, soft. 6th. Skin natural; pain of head gone; pain of back and limbs continues; slept better; tongue more clean; three stools; pulse 102. 7th. Pain of head not returned; pain of limbs better; tongue still cleaning; three stools; pulse 96.