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.