In London dwell the best as well as the worst people to be found in the world. The advanced spirits, philosophers and reformers, whom the civilization of other European countries is not sufficiently developed to tolerate, seek the asylum of England and make London their home; so, too, of the criminal classes. The most murderous thieves and burglars find in London a hiding place and theatre of operations. London, which was too large even fifty years ago, and was then emphatically one of those accursed "vampires upon the public weal," as Jefferson declared all cities to be, has grown marvelously since, and continues to grow to the wonder of all political economists, who are at a loss to determine wherefore. But such is the fact, and into this great seething sea of human life was it that Mr. McWatters plunged in his first essay at "studying human nature" away from the narrow field of his boyhood's observations. Whoever resides in London, and acquaints himself with what is about him, and mingles in the city's strifes, and comes out unscathed need not fear to trust himself anywhere in the world. MIGRATES TO THE UNITED STATES. Mr. McWatters, after sojourning in London for a while after his marriage, betook himself, with his estimable wife, to this Land of Promise. In London he had made the acquaintance of many of the leading men most interested in questions bearing upon sociology, humane reforms, and philanthropic efforts at the amelioration of the condition of the laboring classes. His warm heart became greatly aroused in seconding the needed reforms which his keen intellect demonstrated were urgent for the good of not only the laborers of London, but of the working classes everywhere; and he brought with him to this country what may properly be termed an intense general anti-slavery spirit, embracing in its sympathy not only chattel-slaves, but wages-slaves, of every kind and color. And this may properly be said to be the chief characteristic of Mr. McWatters; and that he has made this felt for the good of his fellow-men as effectively, perhaps, as any other man living, considering his means and the sphere in which he has operated, cannot be questioned by any one who has attentively read our city journals of the last ten years especially. The writer has gathered, and has before him, not less than two hundred and twenty different extracts from the papers of New York, in all of which Mr. McWatters is complimentarily spoken of in reference to his benevolent action, his humanitary deeds to the poor and suffering, or his active coöperation with some great public charity.