In concluding this chapter we will confine our labor to an effort to direct the beginner to a correct method of reasoning. When he is brought face to face with the stern realities of the "sick room," the Osteopath begins his inquiries and follows with his questions just far enough to know what division of the body is in trouble. If he finds an arm has lost motion, he goes to arm to explore for cause. He can begin his hunt for cause at hand, explore it carefully for wounds, strains or any lesion that could injure nerves of the arm. If he finds no probable cause there, he should explore bones for dislocations or strains of ligaments at elbow; if he finds no defect there sufficient to locate cause in lower arm or hand; he has only two more places left to inspect, the shoulder and neck with their articulations of bone and muscles. If found normal at shoulder, then go to neck, out of which go all or most of the nerves of the arm; if he finds no lesion or cause equal to the trouble so far, then he has been careless in his search and should go over and over from marrow to periostium of all bones of the neck and head, because there are only five divisions in which a lesion can exist. Carefully look, think, feel and know that the head of the humerus is true in the glenoid cavity, clavicle true at both ends of its articulation, with sternum and acromion processes. See that the biceps are in their grooves, and ribs on spine are true at manubrium and spine, and that neck is true on first dorsal. True in all joints of the neck, as the nerves of the arm come from the neck, there must be no variation from normal, or trouble will appear from that cause. As the neck has much to do with the arm, we should keep a living picture of the forms of each bone, how and where it articulates with others, how it is joined by ligaments, what blood vessels, nerves and muscles cross or range with it lengthwise, because to overlook a small nerve and blood vessel you may fail to remove a goitre, and all diseases of the head, face and neck. CHAPTER III. THE HEAD. A Free Circulation--Death Blows--Something of the Neck--Order of Treatment--The Pelvis--Brains of Animals--Arterial Motion--Mental Vibrations--Overburdening the Mind--Hemiplegia. A FREE CIRCULATION.