Muscular action, however, cannot take place without nervous action. These two tissues are dependent one on the other. Yet the muscular tissue may be considered as subordinate to the nervous tissue. While the muscular tissue may become totally inactive or incapacitated, or even removed, the brain tissue may retain its activity and continue to perform its functions. The very reverse takes place when the brain is either injured or removed. We know by experience, experiments, that injuries or other pathological changes will cause impairment to muscular tissue. It is hard to conceive, and harder still to understand, that an animal--man included--is nothing more than a vitalized machine, composed in the first place of two distinct working parts--muscular and nervous--while all the other portions have to perform duty in order to sustain them. The word function is a term applied to all tissues in general, as kidneys, liver, stomach, etc.; each has its function. So have muscles and nerves. The former has for its function contraction, while the latter has for its function to control and regulate that contraction. The first part of the machinery is governed and checked by the domination of the other. That dominion, that control, is termed Volition, in other words, will power! 1. Will power! What is it? It is a power which every animal possesses, and every animal exercises, in accordance with its particular organization and degree of organic development. 2. Every animal has the power, with the aid of its senses--five senses of sight, hearing, smelling, tasting, feeling--to select substances from the vegetable and mineral kingdom, for its immediate want, for the sustenance of life. 3. It has the power of locomotion to go in search for those substances, and to carry them to a place of safety, for present or future use. It has the power to select the kind of food, to choose that which is beneficial and reject that which is injurious. The five senses direct in that selection. 4. The animal has will power to protect and defend his possessions--through his senses the brain directs and the muscles act. 5. The animal has will power, when the organs of procreation are developed, to choose a partner for the production of young. The senses serve in making the selection, as regards beauty, form, size, etc. 6. It has the will power to nourish and protect its young or to destroy it. 7. Animals have the will power to build their habitation, their home, and furnish it in a manner best suited for their comfort. 8. Animals have the power to articulate sound, and have the will to communicate with each other if they so desire, to antagonize or to quarrel. 9. They have the will power to select from the surrounding elements. They choose water, air, sunshine, high or low altitudes; they migrate from warm to cold, and from cold to warm, climates.