These tissues are the all-important tissues in the body. The muscular tissues constitute and carry out the power, force, or energy of the body. They set the body in motion. They do the work. They regulate the delicate movements of the organs of special sense or function, as the eye, the ear, the tongue, the nose, larynx, thorax, abdomen; and fighting, defending, building, destroying, labor and mechanical skill of whatever nature, depend on them. Of exercise, sport, pain and pleasure, sensation, emotion, expression of the face, in fact all in all in every act of life, the muscles, the voluntary muscles, must perform the work. They are called the muscles of Animal life. They are Voluntary; they may be set in action at will. For guidance, control, coördination, sensation, and motion, the muscular tissues are dependent on the nervous tissues. It is not difficult to understand, I think, as will be explained later on, that all muscular movements are perfectly natural, purely physical and mechanical. The nervous tissue will be a little more difficult to comprehend, for causes that are reasonable and plain. All animals are provided with two distinct sets of organs: 1. The master tissues, the nervous and muscular tissues, the voluntary muscular tissues, which are the organs of animal life, the voluntary, the active organs that do the work, consume the food, and throw off the waste material; and 2. The servants to these, the involuntary tissues, the organs of organic life that prepare the food, carry it to the master tissues, and bring away the waste material. The inherent qualities of both these sets of organs are instinctive, with this difference--the former, the voluntary, the controlling and working master tissues, are capable of development, progressively, acquiring intelligence, maturing into educatedness, etc. The latter, the involuntary, are simply servants to these, and they perform their functions in the same manner instinctively all through life. The muscular and nervous tissues are the educable tissue. By repetition, practice, and exercise they improve and at length exhibit certain degrees of skill in the performance of their work. On the other hand, the organs of mastication, deglutition, digestion, absorption, excretion, circulation, and respiration simply perform their functions instinctively, without possessing the capacity of improvement, and without regard to volition. These act involuntarily throughout life, as preparers and carriers of nourishment to the master tissues, and removers of waste material. The work of the muscular tissues is comparatively easy to understand. We can see the work done, can account for it, can demonstrate it. The performances are capable of absolute proof, and controversy therefore is out of question.