check put upon their growth by their cannibalism is lamentably small when compared to their enormous multiplying powers, which surpass those of any other animal. The writer had a curious experience in regard to the rat's sociability and companionship. He had once confined in a cage a company of twelve big slaughter-house rats and happened to neglect feeding them one evening. The next morning he was rather astonished to find a well polished backbone, a stubby remnant of tail, and only eleven other rats, all huddled up together compactly, in the congregation. He then gave them some food to stop them from further feeding on each other, but they rudely refused this, and he was again surprised to see ten of the number make a combined attack, that looked as if agreed upon, upon one unfortunate but especially large sized rat. The latter tried desperately enough to hold his own against such fearful odds, with much horrible squealing and screaming among them and a great deal of severe scratching, dashing, and tumbling against the tin-lined sides and the wire roofing of the cage. In a few seconds they were ranged all around in a circle feeding ravenously on the remains of the brave but ill-fated warrior. The writer has noticed, in numerous instances where numbers of rats were kept together in a cage, that they would on some occasions, just as the humor seemed to strike them, prefer their relatives and brethren as food to anything else. It did not matter, either, what other form of diet or delicacy had been set before them. V.--MULTIPLYING POWERS. Great quantities of rats are trapped and poisoned and hunted down by all animals larger than themselves; they are driven out of their homes, and systematically destroyed by paid vermin-destroyers; still all this seems to make but very slight impression on their numbers as they constantly pop up serenely from below just as if "Sure Pop" and rat-traps had only a mythic existence in fairy tales. They multiply prodigiously, the female breeding on the average about eight times a year, and having as many as fourteen at a litter, though in some instances this record has been badly beaten. A writer on this subject calculates that from a single pair of New York rats, living in moderately good circumstances, there will spring in three years' time a snug, happy little family of 650,000 rodents, including mother, father, children, grandchildren, great-grandchildren, etc., and making due allowance for emergencies, accidents, and for a few hundred of them having been overpowered and used for food by the rest of this most worshipful company. He allows an average of eight young at a litter, half male and half female, the young ones having a litter at six months old. One cause of their being so prolific is that they flourish and breed as well on an abundance of swill, refuse, and garbage, as if they were carefully and tenderly fed three times a day. VI.--THE RAT'S UNABRIDGED BILL OF FARE.