The facts or ideas contained in a book constitute its body. The language in which they are conveyed to the reader constitute the clothing of the body. For the first no copyright is allowed. Humboldt spent many years of his life in collecting facts relative to the southern portion of this continent; yet so soon as he gave them to the light they ceased to be his, and became the common property of all mankind. Captain Wilkes and his companions spent several years in exploring the Southern Ocean, and brought from there a vast amount of new facts, all of which became at once common property. Sir John Franklin made numerous expeditions to the North, during which he collected many facts of high importance, for which he had no copyright. So with Park, Burkhard, and others, who lost their lives in the exploration of Africa. Captain McClure has just accomplished the Northwest Passage, yet has he no exclusive right to the publication of the fact. So has it ever been. For thousands of years men like these— working men, abroad and at home—have been engaged in the collection of facts; and thus there has been accumulated a vast body of them, all of which have become common property, while even the names of most of the men by whom they were collected have passed away. Next to these come the men who have been engaged in the arrangement of facts and in their comparison, with a view to deduce therefrom the laws by which the world is governed, and which constitute science. Copernicus devoted his life to the study of numerous facts, by aid of which he was at length enabled to give to the world a knowledge of the great fact that