When we reflect on the magnitude of the pre-Christian Alexandrian libraries, as well as the magnificent appointments attaching to and lavish wealth expended upon the ancient University of the capital of the Ptolemies, we seem almost unable to realise the fact that people of education and intellect, until quite lately, believed that all this intellectual and literary magnificence had reached that pitch of excellence in the short space of less than four thousand years. In this period of time it was believed that man had so far risen in intellectual capacity from the absolutely ignorant condition of the first pair as described in Genesis as to have reached that state of mental perfection possessed by the professors in the Alexandrian, Athenian, and Sicilian schools. We can see Professor Euclid pointing out on the blackboard how, the sides of a rectilinear polygon all touching a circle, the area of the polygon is equal to the rectangle contained by the radius of the circle and the semi-perimeter of the polygon; Professor Archimedes would be explaining the theory that, if a force act upon a body, the measure of the force in absolute units is numerically equal to the time-rate of change of momentum and to the space-rate of change of kinetic energy; Professor Eratosthenes would be impressing upon his class the importance of the knowledge of the globular shape of the earth; and Professor Hipparchus would be startling his hearers by stating that he would show them how the failure of the sun to reach the same point in the same time in his annual circuit (according to the old geocentric theory) caused the vernal equinoxial sign to give place to the next zodiacal sign every 2,152 years. Here was a galaxy of intellectual attainments indeed! With such a picture before our eyes we are calmly asked to believe that so little time as less than four thousand years had been sufficient for the building up of this vast intellectual edifice out of such rude materials as the man and woman of Eden, when the two thousand years following have been productive of so little advancement, notwithstanding the exquisite materials upon which to work that were left for us by the Alexandrian and Athenian sages. We cannot believe so evident an absurdity to-day; and yet it is little more than half a century since the whole of Christendom accepted without any doubt whatever the old traditional statement of the Church that man had only inhabited this earth for rather less than six thousand years.