ABSTRACT
During the early morning hours of February 26th 1894, the landing-stage in front of the house of the controller at Semitau was the scene of unwonted bustle and activity, caused by the organisation of our flotilla for the expedition to the Upper Mandai. One bend higher upstream the water had run so low, that near the right shore cliffs of a loose sandstone rich in coaly particles and containing numerous stringlets of coal become exposed. They are full of pot-holes varying in their dimensions from 10 to 70 centimetres. As a farewell greeting the mountains of the Upper Mandai treated us to most magnificent fireworks, in the shape of a terrific thunderstorm, and the peals of thunder resounded through the mountains till far into the night. None of the tributaries of the Mandai drains so large a piece of this part of the Müller mountains as the Kalis.
