Our men had been complaining of severe headache, giddiness, and violent pains in the spine and between the shoulders. I had been anxious when at Gondokoro concerning the vessel, as many persons while on board had died of the plague, during the voyage from Khartoum. The men assured me that the most fatal symptom was violent bleeding from the nose; in such cases no one had been known to recover. One of the boatmen, who had been ailing for some days, suddenly went to the side of the vessel and hung his head over the river; his nose was bleeding!