Notwithstanding the more substantial food Natty had now got, he was still too weak to walk any distance. The flesh of the gnu, with the honey and mushrooms, enabled us to subsist in tolerable plenty for a week. The portions I had smoked and dried, at the end of that time became almost uneatable, and I saw that I must succeed in killing another animal, or that we should starve. That night I was awaked from sleep by hearing a low cry of distress. The dreadful thought seized me that a hyena had come into our cavern and carried off Natty. I anxiously put out my hands, and to my relief found that he was on his bed, breathing quietly. Then I thought that he must have cried out in his sleep. But again that low wail of distress reached my ears. It is some human being, I thought to myself, attacked by wild beasts, or fallen into a lagoon; indeed, it sounded exactly like the cry of a person in danger of drowning. Perhaps it may be one of our friends come in search of us. Again it came through the night air. I could bear it no longer, for I was certain that a fellow-creature was in danger. I awoke Natty. "Do not be alarmed," I said; "I hear some one calling for help. I must go out and see what I can do, but I will be back presently. Remain quiet till my return!" Seizing my rifle, and feeling the lock to ascertain that it was all right, I hurried out in the direction from whence the sounds came. Again that plaintive cry reached my ear. I thought I heard the very words,--"Come, come! Help, help!" I dashed forward, for I knew the ground thoroughly. It could not be a person drowning, for there was no lagoon in that direction. As I advanced the wails became lower and lower, and sobs alone reached me. I was afraid that I was too late to render help. Presently, bending down, to be more certain of the direction I should take, I saw against the dark sky the outline of a lion. His claws were on his prey, and his tail was moving round. "He has killed the man, I fear," I thought. Still, regardless of the danger I was running, and urged by an impulse I could not resist, I rushed forward, ready to fire should the lion advance towards me. I shouted at the top of my voice. I went on till I was within a dozen yards of the brute, and then once more raised a loud and determined shout. As I did so he turned his head, and then uttering a loud growl, slowly stalked away, and disappeared behind some bushes at a little distance. I hurried to the spot he had quitted, but instead of a human being, I saw before me an animal stretched lifeless on the ground. On feeling the head, I discovered that it had no horns, and then, taking one of the hoofs in my hand, I found that it was either a zebra or quagga. To leave it there would be to ensure its being carried off by its destroyer. I therefore set to work as well as I could in the dark, and cut off the flesh, looking up cautiously every minute, as may