The mental and physical limitations and imperfections of men and women of the present day make it impossible for them to meet satisfactorily the great majority of the requirements of their present environment, and render them quite incapable of making the best of their capabilities in any new environment. These instinctive guiding principles, not even perfectly balanced as in the case of the savage and the animal, are miserably insufficient to meet the conditions of the modern world with its ever changing environment. Yet it is upon these instincts that men and women rely, to the detriment of their mental and physical attainments. 2. My next claim is that all such diseases as those referred to above (e.g., cancer, appendicitis, bronchitis, tuberculosis, etc.) are too often permitted to remain uneradicated and frequently undetected, and so to develop in consequence of the failure to recognise that the real cause of the development of such diseases is to be found in the erroneous preconceived ideas of the persons immediately concerned, ideas which affect the organism in the manner described in Part I of this book. The only experience which the average man or woman has in the use of the different parts of the human organism is through his or her subconsciousness. The result is a subconscious direction which in the imperfectly co-ordinated person is based on bad experiences and on the erroneous preconceived ideas before mentioned. Small wonder, then, that such direction is faulty and leads to the development of serious defects and imperfections. With this erroneous direction even the attempt to carry out a simple action in accordance with subconscious habit is fraught with danger, for it invariably affects in a detrimental manner other parts of the subject’s organism which have nothing to do with the particular act or acts attempted. For instance, in the subconsciously controlled person the attempt to lengthen the neck is invariably preceded by a movement of the eyes in an upward or downward direction. Wrong use of the eyes in this or some similar manner too frequently is the forerunner of what eventually develops into an established habit, often causing an unnecessary and undue strain of the eyes which seriously impairs their efficiency, and which in the ordinary way of life leads to the specific treatment of these organs. It is obvious, however, that what is needed in such a case is the eradication of the erroneous preconceived idea and harmful habits, thereby removing gradually the undue and unnecessary strain upon the organs of sight. This will enable them to regain their lost efficiency and it is almost certain that specific treatment of any kind on orthodox lines will be unnecessary. In consequence of faulty guidance misdirected energies are not confined to one part of the organism. They affect the hands, arms, shoulders, legs, thorax, hips, knees, ankles and other parts of the organism, frequently causing strain and interference with the