Everyone is in the habit of forming a hasty opinion of another by reading his face and noting his expression. But the indication given by facial expression is mainly the product of the life that has been lived, and tells something of the part that the hidden emotions have played on the body. It has been generally believed that mind has its seat in the brain and the nervous system. Later investigations, however, seem to show that it is the product of the whole physical organism. There is no chance to measure or weigh or still less assay the qualities of the machine. It is certain that the quality of the mind depends very little upon either the contour or size of the skull. About all that can be learned of the mind and the character of the man must be gathered from the manifestation of the machine. It is shown by his behavior in action and reaction. This behavior is caused by the capture, storage and release of energy through the ductless glands. A defective mechanism either inherited or acquired through imperfectly balanced glands will inevitably produce an imperfect mind and defective conduct. This it will be bound to do because the body is the mind. As a matter of fact, no man is branded physically with the "mark of Cain." If criminology were so simple it would not be difficult to handle. The manifestations of the human machine are infinite and only patience and careful study can find the points of weakness and of strength. That all brains and bodies have both is beyond dispute. No physical human structure was ever put together where the organs were equally strong to do the work assigned to them. Some part of the body always needs watchfulness and repair and can never be depended upon in emergencies. In times of overstress and strain, the defective organ or organs will manifest their weakness. The intricate nervous system and the brain, the unseen instincts and emotions likewise do not work perfectly; but as a rule the ones that underwork or overwork cannot be seen by a physical examination. It generally requires great subtlety to find them, and careful treatment and environment to make the machine work fairly well in spite of these imperfections. This could be provided; in most cases the machine could be placed in an environment where it would work fairly well; but instead of this all the effort that is made to keep the machine in shape is a threat of the jail if it goes wrong; it is then left to run itself without help or assistance of any kind.