Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: CHAPTER II MATTER AND ENERGY When we look round us to find out what kind of objects or phenomena the Universe consists of, we shall at first sight notice three different groups in which all the facts of our experience may be comprised. In the first place, there is what we know as matter, existing in three different forms, of solid, liquid, or gas. In the second place, there are facts of a different character: heat, light, sound, electricity, motion, which appear quite different from what we know as matter, but have something in common with each other which causes us to place them all in one main group of external phenomena. In the third place, there is yet another order of facts, which can be loosely designated under the appellation of life and consciousness. At first glance, these vital and mental phenomena appear to have nothing in common with either of the two other groups. Their processes take place within us and are subjective, whereas the processes of the other two groups are outside us, and therefore objective. In these three fundamental categories all the facts of human experience are comprised. This analysis into three categories is, however, merely provisional. It arises from our first casual glance to see what is the raw material out of which the Universe is exclusively built up. A closer examination reveals the fact that the differences between the groups are more apparent than real, and that when we come to inquire more closely into the actual constitution of each, the differences sink away, and lead us to believe that the Universe is built up, not out of three different kinds of raw material, butfrom one kind only, which manifests itself to us from three separate points of view. The third group, that of life and consciousness, is dealt with in the following ...