The story was true to life for, times without number, blind men and women have shown their ability to work as effectively as if they could see. More than two hundred years ago a teacher in London named Richard Lucas lost his eyesight. Many of his friends thought that he would, of course, give up all idea of being a useful man; in that day few thought of the possibility of one so afflicted doing anything worth much. But the young man thought differently. He listened to others as they read to him, and completed his studies. He became the author of a dozen volumes, and was among the leaders of his day. One of his greatest works was the book "An Enquiry after Happiness." He knew how to be happy, in spite of his affliction, so he could teach others to follow him. A little earlier there lived on the farm of a poor Irishman the boy Thomas Carolan. When he was five years old, he had smallpox, a disease that was much more virulent in those days than it is to-day because the treatment required was not understood. As a result the boy lost his sight. Soon he showed a taste for music, and he was able to take a few lessons, in spite of the poverty at home. As a young man he composed hundreds of pieces of music, and it has been said of him that he contributed much towards correcting and enriching the style of national Irish music. Another youthful victim of smallpox was Thomas Blacklock, the son of a bricklayer in Scotland. "He can't be an artisan now," his friends said. But it did not occur to them that he could be a professional man. His father read him poetry and essays. When he was only twelve the boy began to write poetry in imitation of those whose verses he had heard. After his father's death, when the blind boy was but nineteen, he was more than ever dependent on himself. By the help of a friend he was enabled to go to school for a time. Then he became an author, and, later, a famous preacher. Often, as he walked about, a favorite dog preceded him. On one occasion he heard the hollow sound of the dog's tread on the board covering a deep well, and just in time to avoid stepping on the board himself. The covering was so rotten that he would surely have fallen into the water.