The mean temperature at the station of Tewfikeeyah had been:
In the month of May, at 6 a.m. 73 degrees Fahrenheit " at Noon 92 degrees " " June, at 6 a.m. 72 degrees " " at Noon 86 degrees " " July, at 6 a.m. 71 degrees " " at Noon 81 degrees "
During May we had heavy rain during 3 days. " " light " " 4 " 7 days.
During June we had heavy rain during 5 days. " " light " " 6 " 11 days " July heavy " " 10 " " " light " " 4 " 14 days
Sickness increased proportionately with the increase of rain, owing to the sudden chills occasioned by the heavy showers. The thermometer would sometimes fall rapidly to 68 degrees Fahr. during a storm of rain, accompanied by a cold rush of air from the cloud. Fortunately I had provided the troops with blankets, which had not been included in their kit by the authorities at Khartoum.
CHAPTER V.
EXPLORATION OF THE OLD WHITE NILE.
I had long since determined to explore the sudd, or obstructions of the main Nile, in the hope of discovering some new passage which the stream might have forced through the vegetation. A Shillook, named Abdullah, closely connected with Quat Kare, had promised to accompany me, and to supply the necessary guides. The river was full—thus I started on 11th August, 1870.
The engines of the No. 10 steamer had been thoroughly repaired during our stay at Tewfikeeyah. I had loaded her to the maximum with well-cut "Soont" (Acacia Arabicce), which is the best fuel; and knowing, by the experience of former years, that a scarcity of wood existed near the Bahr Gazal, I had loaded one of the largest vessels (about seventy tons) with a supply, to accompany us as a tender. I had also filled my diahbeeah with selected fuel.
We steamed thirteen hours from Tewfikeeyah, with the tender and diahbeeah in tow, and reached the old sudd about twelve miles beyond the Bahr Giraffe junction. The water below the sudd was quite clear from floating vegetation, as it had been filtered through this extraordinary obstruction.