5. Mineral, Plant And Animal Creation

Let us begin by thinking of our present atmosphere which we regard as being devoid of life. Even this atmosphere proves to be quite different from anything to be found in early periods of the Earth’s evolution. Still further in the past something resembling the solid core of the Earth as we know it today is in evidence, surrounded by an atmosphere. But in those days there was nothing at all like the air we breathe today. In this air oxygen and nitrogen play the most prominent part, carbon and hydrogen a subsidiary role, sulphur and phosphorus a role of less importance still.