<p>Ages ago, when the world was young, people did not know as much of nature and its secrets as we do now. Moreover, they did not have the art of writing, or if known to them, it was used only by a few, and its value for handing down the facts of history was not clearly understood. Thus, two great fields of knowledge, the world of nature and the world of history, were known only in a dim and vague way. Yet men and women were even then anxious to ...