The science of geology teaches us that the earth has not always possessed its present familiar appearance. On the contrary, countless years were consumed in molding it to its present shape, and even yet it is undergoing constant change. It is supposed that in the beginning all was a chaotic heap of Matter. In the words of a familiar story: "The earth was not solid, the sea was not liquid, nor the air transparent. All lay in confusion."
In some mysterious way,—that nobody understands—Motion was started in this chaotic whole. Gradually the mass became more and more compact; at the same time it became very hot. Revolving on an imaginary axis, the mass grew rounder and rounder, flattening slightly at the poles, or the ends of the axis. Gradually the surface of the mass cooled, and cooling, formed the earth's crust. Because it did not cool evenly, but shrunk to fit the still molten mass, this surface or crust was left with deep crevasses and high ridges. This marked irregularity was further increased by mighty upheavals caused by pressure of heat from within. Thus were many of the mountains formed.
This process, so slightly indicated here, extended over a vast period of time. It is supposed that later, for a protracted period, rain fell. When the age of rain had passed, the deep depressions in the earth's surface were left filled with water—our present oceans and some of the seas. It would be impossible for us to review rapidly all the stages through which the earth passed in its making. Suffice it to say that conditions upon it were not always favorable to life as we know it. In course of long geological ages—perhaps millions and millions of years—forests of trees, plants, shrubs and flowers sprang up and covered the bare earth. Last of all, probably, man appeared. How all these things came about no one understands, but it is generally accepted that they occurred in an order similar to that just given. It would be useless for us to inquire into all the reasons that have led to these conclusions, but the most important one has been evidences within the earth itself.
Men who work deep down in mines know that as they descend lower and lower, the temperature rises, until there is a noticeable difference between the temperature at the entrance of a mine and at its lowest point. Moreover, not infrequently volcanoes pour forth streaming lava, smoke and fire accompanying the eruption. While such evidences lead to the conclusion that the temperature of its interior is very high, still there are many reasons for believing that the earth is a solid mass. From the examination of the various earth strata, their composition and the evidences each bears of the conditions under which it was formed, we learn of periods of rain, heat and cold prevailing. All these facts belong to the realm of geology however, and concern us here only as they have concerned the progress of mankind. These same earth layers or strata which preserve eloquent testimony regarding the earth's development, contain also remains of prehistoric men—men who lived in the far away time before records were made and of which the rocks alone give testimony.
Of the beginnings of the human race we know nothing. Many scientists, notably Darwin and his followers, have sought to show that man evolved from some lower animal life, in a way similar to that in which we find some plant or flower perfected from inferior origin. Whether the theory of man's evolution from some lower animal will ever be shown to be true the future alone can tell. Nevertheless the scholarly world today has generally accepted the evolutionary view of life and the world.
Buried within the earth along river-beds, around cliffs, in mounds and many other places, have been found remains of primitive man. While the beginnings of the human race, as has been said, are utterly unknown, the earliest stage of which we have knowledge has been called the Paleolithic Age,—the age of the River-drift Man.
Whether we accept the theory of man's evolution from the lower animal kingdom or not, we must admit that the earliest Paleolithic people of whom we have knowledge differed but little from the wild beasts. They lived in caves along rivers,—natural retreats where wild animals might have taken refuge. They lived on berries, roots, fish and such small game as they could kill by blows. They did not cook their food, but devoured raw meat much as did the wild beasts. They did not even bury their dead. From the stones accessible to them they selected their weapons, chipping them roughly. The crude weapons of this period have given it the name of the Rough Stone Age.
The Paleolithic man, or man of the Rough Stone age, did not try to tame the beasts he encountered. He stood in great fear of those with whose strength he was not able to combat. He feared especially strange beings like himself, and with his family dwelt apart from others so far as possible. He did not plant nor gather stores for the future; thus when food failed in his vicinity, he was obliged to roam on until he came upon a fresh supply of acorns, berries, roots and small animals. Any cave served for his dwelling. He protected himself from cold by a covering made from the skin of the beast he had slain. He had few belongings and these were scarcely valued, being easily replaced.
It is not difficult to see why the man of the Rough Stone Age preferred to live by the side of some river. In early times, before paths were worn through the forests, travel was easiest along the river bed. Food was more abundant here, for fish inhabited the streams and thither also animals came to drink, and in the reeds by the river's side, birds and wild fowl breeded. Moreover, man was a timid creature and feared to venture far inland.
From all this we see that man in his primitive state gave little promise of his future development. For how long a time he continued in this stage, we cannot estimate. Yet we find a decided improvement in the latter part of this Paleolithic Age, for fire and its uses became known. This brought about a wonderful change.