A great many years ago, Augustus Caesar, then Emperor of Rome, ordered his mighty realm to be taxed; and so, in Judea, it is said, men went to the towns where their families belonged, to be registered for assessment. From Nazareth, a little town in the north of Judea, to Bethlehem, another little but more famous town in the south, there went one Joseph, the carpenter, and his wife Mary, -obscure and poor people, both of them, as the story goes. At...