would exhibit a figure very different from the common one; for I am convinced by experiment, that a web of the finest muslin, wrapt round the body at Sennaar, will occasion at mid-day a greater sensation of heat in the body than the rise of 5° in the thermometer of Fahrenheit. At Sennaar, from 70° to 78° in Fahrenheit's thermometer is cool; from 79° to 92° temperate; at 92° begins warm. Although the degree of the thermometer marks a greater heat than is felt by the body of us strangers, it seems to me that the sensations of the natives bear still a less proportion to that degree than ours. On the 2d of August, while I was lying perfectly enervated on a carpet, in a room deluged with water, at twelve o'clock, the thermometer at 116°, I saw several black labourers pulling down a house, working with great vigour, without any symptoms of being at all incommoded. The diseases of Sennaar are the dysentery, or bloody flux, fatal in proportion as it begins with the first of the rains, or the end of them, and return of the fair weather. Intermitting fevers accompany this complaint very frequently, which often ends in them. Bark is a sovereign remedy in this country, and seems to be by so much the surer, that it purges on taking the first doze, and this it does almost without exception. Epilepsies and schirrous livers are likewise very frequent, owing, as is supposed, to their defeating or diminishing perspiration, or stopping the pores by constant unction, as also by the quantity of water they deluge themselves with at the time they are hottest. The influence of the moon in epilepsies, and the certainty with which the third day after the conjunction brings back the paroxysm in regular intermitting fevers, is what naturally surprises people not deeper read than I am in the study of medicine. Those who live much in camps, or in the parts of Atbara far from rivers, have certainly, more or less, the gravel, occasioned, probably, by the use of well-water; for at Sennaar, where they drink of the river, I never saw but one instance of it, that of the Sid el Coom; as for Shekh Ibrahim, whom I shall speak of afterwards, he had passed a great part of his life at Kordofan. The venereal disease is frequent here, but never inveterate, insomuch that it does not prevent the marriage of either sex. Sweating and abstinence never fail to cure it, although, where it had continued for a time, I have known mercury fail.