He at once drew out his revolver, which he always carried strapped to his belt, and discharged the six chambers, waiting for half a minute between each shot, and listening intently for an answer to his signal. None came. The stillness of the wood was unbroken, and Frank felt that he must have wandered far indeed from his starting place, and that he was completely lost. His first impulse was to start off instantly at the top of his speed, but a moment's thought convinced him that this would be useless. He had not an idea of the direction which he should pursue. Besides the sun was sinking, twilight is short in the tropics, and in half an hour it would be as dark as midnight in the forest. Remembering his adventure with the leopard he determined to climb into a tree and pass the night there. He knew that an active search would be set on foot by his friends next morning, and that, as every step he took was as likely to lead him from as towards the camp, it was better to stay where he was. He soon found a tree with a branch which would suit his purpose, and, climbing up into it, lit his pipe and prepared for an uncomfortable night. Frank had never smoked until he reached Africa, but he had then taken to it on the advice of Mr. Goodenough, who told him that smoking was certainly a preventive, to some extent, of fever in malarious countries, and, although he had not liked it at first, he had now taken kindly to his pipe, and smoked from the time when the evening mists began to rise until he went to bed.