In order permanently to cure anything its cause must be removed. And it stands to reason that if a patient persists in poisoning himself with coffee, tobacco, or alcohol; or suffers from an impoverished condition of the blood, or from a brain tumor, lead poisoning, or an injury, or has some constitutional or organic disease or some spinal lesion, which is the basis for his eye trouble, permanent relief will not follow unless these causes are removed or corrected. [Illustration: Non-Electrical Applicators Useful in Zone Therapy _*A*_ is an ordinary surgical clamp which can be used for clamping the tongue. _*B*_ is an ordinary eye-muscle retractor. This can be used for intermittently retracting the posterior pillars of the fauces. _*C*_ is a special type of nasal probe used for attacking the posterior wall of the nasopharynx. _*D*_ is a regular palpebral retractor which can be used for intermittently retracting the soft palate, especially in the region of the fossa of Rosenmüller. _*E*_ is a regular flat applicator bent up at one end. This is useful about the throat and fauces. It can be used as a pressure applicator for the posterior wall of the oropharynx. _*F*_ is an ordinary aluminum comb used for attacking the fingers or toes either at the tips or about the joints. FIG. 11.] But if he has a condition due to an excess of nerve or muscle tension, or if he has trouble produced by faulty circulation from any cause, squeezing his fingers will come nearer to curing him--and more expeditiously and satisfactorily--than any other treatment. If you don’t believe it, try it. It costs nothing but a few minutes’ intelligent effort. CHAPTER V. MAKING THE DEAF HEAR. Too much knowledge is a dangerous thing. For it keeps one thus afflicted from acquiring more. Of course it seems outlandish and quite beyond the pale of reason, to ask a man who can minutely describe the semi-circular canals of the ear, or bound the internal labyrinth on the north, south, east and west, to believe that by pressing with a blunt probe behind the wisdom tooth, or at the angle of the jaw on the upper surface, the hearing of the adjacent ear can be materially benefited. Or that a similar result would follow squeezing upon the joints of the ring finger, or the toe corresponding to the ring finger. And this, after every other scientifically accredited method, administered by the world’s greatest specialists, had failed. Yet such is the fact. For it is the experience of physicians, familiar with the practice and principles of zone therapy, that nine out of ten cases of otosclerosis (thickening or chronic congestion of the membranes of the ear) can be improved from 25% to 90%. And, that ringing in the ears and “ear noises,” or catarrhal deafness, can be relieved in an even larger number of cases. If there is any hearing left at all, these methods are almost certain to improve it.