In an earlier paragraph I pointed out that John Doe was suffering from certain mental and physical delusions, and I endeavoured to show how these delusions militated against his recovery of health. Returning to this point now that the correct method has been indicated, I may use his case to give another example of this method. What John Doe lacked was a conscious and proper recognition of the right uses of the parts of his muscular mechanism, since while he still uses such parts wrongly, the performance of physical exercises will only increase the defects. He will, in fact, merely copy some other person in the performance of a particular exercise, copy him in the outward act, while his own consciousness of the act performed and the means and uses of his muscular mechanism will remain unaltered. Therefore before he attempts any form of physical development, he must discover, or find some one who can discover for him, what his defects are in the uses indicated. When this has been done he must proceed to inhibit the guiding sensations which cause him to use the mechanism imperfectly; he must apprehend the position of mechanical advantage, and then by using the new correct guiding sensations or orders, he will be able to bring about the proper use of his muscular mechanism with perfect ease. If the mechanical principle employed is a correct one, every movement will be made with a minimum of effort, and he will not be conscious of the slightest tension. In time a recognition will follow of the new and correct use of the mechanism, which use will then become provisionally established and be employed in the acts of everyday life. For instance, if we decide that a defect must be got rid of or a mode of action changed, and if we proceed in the ordinary way to eradicate it by any direct means, we shall fail invariably, and with reason. For when defects in the poise of the body, in the use of the muscular mechanisms, and in the equilibrium are present in the human being, the condition thus evidenced is the result of an _undue rigidity_ of parts of the muscular mechanisms associated with _undue flaccidity_ of others. This undue rigidity is always found in those parts of the muscular mechanisms which are forced to perform duties other than those intended by nature, and are consequently ill-adapted for their function. As Herbert Spencer writes: “Each faculty acquires fitness for its function by performing its function; and if its function is performed for it by a substituted agency, none of the required adjustment of nature takes place, but the nature becomes deformed to fit the artificial arrangements instead of the natural arrangements.”