These writings of the Hebrews were held to constitute a class apart, and were looked to as having an authenticity not to be claimed by any other ancient documents; and while no two scholars of authority, making independent computations, were ever able to agree as to the exact facts connoted by the Hebrew chronology, yet none the less, each prominent investigator clung with full faith to his own estimate, and several of them found schools of followers who battled as eagerly as the masters themselves for the exact dates they believed to be represented by the vague Hebrew estimates. Generally speaking, these estimates ascribe the creation of the world and of man to a period about four thousand years before the Christian era; the year of the Deluge, which was supposed to have engulfed all the inhabitants of the earth except a single family, being variously estimated between the years 3200 and 2300 B.C. That some such figures as these represented the truth regarding a period of man’s residence here on the earth came to be accepted throughout Christendom as an article of faith, to question which was a rank heresy.
The larger figures which the Greeks, Egyptians, Mesopotamians and other nations had employed came to be regarded as absurd guesses, which it were a sacrilege to countenance now that the truth was known; and yet, as every one nowadays knows, these larger figures, vague guesses though they were, approach much nearer to the actual truth than the restricted numbers that supplanted them.
The changed point of view with which the modern historian regards the ancient chronology has been attained through a process of scientific development extending over about a century. A truer knowledge of the cosmic scheme did not bring with it as a necessary counterpart the correct conception as to the length of time that this scheme had been in operation.
Laplace, in formulating his nebular hypothesis, had nothing definite to say as to the length of time required for its development, and there was nothing in his computation to throw any light whatever upon the antiquity of the earth as a habitable sphere.
Cuvier, the great contemporary of Laplace, no doubt accepted the nebular hypothesis as a valid explanation of the origin of the world, but he held to the conception of about six thousand years for the age of man as rigidly as did any Middle Age monk. Cuvier was the first to demonstrate that certain fossil skeletons belonged to no existing species of animal. In other words, he believed that races of great beasts had once inhabited the earth, but no longer have living representatives. This, however, did not suggest to him that the earth had long been peopled, but only went to show, as he believed, that a great catastrophe, as the universal flood was supposed to have been, had actually taken place. It remained for Charles Lyell, the famous English geologist, working along the lines first suggested by another great Englishman, James Hutton, to prove that the successive populations of the earth, whose remains are found in fossil beds, had lived for enormous periods of time, and had supplanted one another on the earth, not through any sudden catastrophe, but by slow processes of the natural development and decay of different kinds of beings.