The lions seemed to have got a bad fright the night Brock and I sat up in wait for them in the goods-wagon, for they kept away from Tsavo and did not molest us in any way for some considerable time—not, in fact, until long after Brock had left me and gone on safari (a caravan journey) to Uganda. In this breathing space which they vouchsafed us, it occurred to me that should they renew their attacks, a trap would perhaps offer the best chance of getting at them, and that if I could construct one in which a couple of coolies might be used as bait without being subjected to any danger, the lions would be quite daring enough to enter it in search of them and thus be caught. I accordingly set to work at once, and in a short time managed to make a sufficiently strong trap out of wooden sleepers, tram-rails, pieces of telegraph wire, and a length of heavy chain. It was divided into two compartments—one for the men and one for the lion. A sliding door at one end admitted the former, and once inside this compartment they were perfectly safe, as between them and the lion, if he entered the other, ran a cross wall of iron rails only three inches apart, and embedded both top and bottom in heavy wooden sleepers. The door which was to admit the lion was, of course, at the opposite end of the structure, but otherwise the whole thing was very much on the principle of the ordinary rat-trap, except that it was not necessary for the lion to seize the bait in order to send the door clattering down. This part of the contrivance was arranged in the following manner. A heavy chain was secured along the top part of the lion’s doorway, the ends hanging down to the ground on either side of the opening; and to these were fastened, strongly secured by stout wire, short lengths of rails placed about six inches apart. This made a sort of flexible door which could be packed into a small space when not in use, and which abutted against the top of the doorway when lifted up. The door was held in this position by a lever made of a piece of rail, which in turn was kept in its place by a wire fastened to one end and passing down to a spring concealed in the ground inside the cage. As soon as the lion entered sufficiently far into the trap, he would be bound to tread on the spring; his weight on this would release the wire, and in an instant down would come the door behind him; and he could not push it out in any way, as it fell into a groove between two rails firmly embedded in the ground.