Charles Kingsley described the grievances of mechanics in "Alton Locke," a work in which the artistic elements are much subordinated to the didactic. A more powerful novel of purpose is Mrs. Gaskell's "Mary Barton," which enlists the sympathies of the reader very strongly with the trials of the manufacturing classes. Not of more literary excellence, but dealing with a subject of far wider interest than that of "Mary Barton," was the "Uncle Tom's Cabin" of Mrs. Stowe. This work is a wonderful example of the capacities of fiction for moving the public mind. Before its publication, great numbers of ordinarily humane people had a general, ill defined horror of slavery. It was felt to be a barbarous institution, a blot on American civilization. But to most people it was a distant abuse, with which they seldom or never came in contact, and of which they only heard the evil effects in a general way. But with the publication of "Uncle Tom's Cabin" the whole Northern public were brought face to face with the question of slavery. Here were individuals, made real and interesting by the power of the novelist, subjected to tyranny and suffering from which every generous nature recoiled. Slavery then assumed a new and more personal aspect, and thousands who were indifferent to the rights of the negroes in general felt a sympathy with the fate of Uncle Tom which easily extended to the sufferings of the whole race. But the extraordinary reputation and circulation given to "Uncle Tom's Cabin" by the world-wide interest in its subject, could not be sustained when public interest in that subject declined; and the volume which at one time occupied the attention of the whole civilized world, fell into comparative obscurity when its mission was accomplished. IX.