The particles combine by reason of some inherent "attraction" existing between certain of them, known as "chemical affinity," etc. Chemical affinity is a peculiar thing - it manifests in likes and dislikes, loves and hates; it is impossible to study these manifestations without recognizing an elementary manifestation of "like and dislike" - "love and hate." You think that this is far fetched, do you? Well, listen to these words from some of the leading scientists about this power to receive sensations, and power to respond to the same, and maybe you will change your mind. Haeckel, the great German scientist, holds that the atoms of which matter is composed may "receive sensations," and "respond to sensations." He dwells upon this fact in his latest works "The Riddle of the Universe," and "The Wonders of Life," and writes as follows regarding "sensation in the inorganic world": "I cannot imagine," Haeckel says, "the simplest chemical and physical process, without attributing the movements of the material particles to unconscious sensation