Five Englishmen were watching a camp fire in the centre of a forest clearing in mid-Africa. They did not speak, but sat propped against logs, smoking. One of the five knocked out the ashes of his pipe upon the ground; a second, roused by the movement, picked up a fresh billet of wood with a shiver and threw it on to the fire, and the light for a moment flung a steady glow upon faces which were set with anxiety.