The fourth class was the most numerous of all. Its distinctive marks were, “the continuance of the inflammatory or febrile symptoms with less interruption than in the other, a pulse more constantly sustained, or soon recovering itself when hurried in the exacerbations; the length and vigour of the exacerbations decreasing in the advance of the disease; and, above all, the prevalent tendency to a favourable discharge by the skin, with the critical sweats on the 3d, 5th, or subsequent days.... Vomiting was a concomitant in about one fourth of the sick. The fever, for the most part, was very moderate the first night, very rarely accompanied with delirium, and almost never with the comatous disposition.... The buboes and carbuncles commonly made their appearance the first day; but it was not unusual to see a successive eruption of these in the course of the disease.... The morning sweat, on the third day, in some cases proved completely critical, but more commonly produced only a remission so favourable as to encourage the expectation of a more favourable crisis on the fifth; but, where the patient neither sweat on the third, nor a sensible remission took place on that day, some degree of danger was always to be apprehended.... After the sweat on the fifth, the subsequent exacerbations proved slighter and slighter, and the buboes for the most part advancing favourably, little or no fever was left remaining after the beginning of the second week, except perhaps symptomatic heats occasioned by the eruptions.” In this class the patients sometimes appeared only to have a slight attack, and yet at last were seized with mortal symptoms, while others who deemed to be much worse at first yet happily recovered and did well, In general the severe pestilential symptoms did not come on till a considerable time after the attack. To the fifth class our author refers all cases of slight infection, wherein the more formidable symptoms of pestilence never concurred, and _all_ the infected recovered. “The access here was often attended with so little apparent disorder, that the eruptions gave the first alarm; and the fever which came on afterwards was frequently so slight as not to confine the sick to the house. Others found themselves indisposed for two or three days, but were not sensible of any febrile heat whatever. But in this class the disease did not always invade thus insensibly. The febrile symptoms, especially the first three days, sometimes run pretty high; and the fever afterward, in nocturnal exacerbations particularly, run out to the end of the week or longer: but, as there was no concurrence of alarming symptoms, and the exacerbations, terminating for the most part in sweats, gradually diminished in force after the third or fourth night, it was not difficult in the worst cases to foretel the event at that period, nor necessary in others to defer the decision so long.