You can absolutely depend upon it that when you have reached a condition in which you can exert the most vigorous pressure upon all of these parts, and do it with comfort and pleasurable results, your "department of the interior" is in a strong and healthy condition. You will find a radical change in the entire internal organism. You will find that the abdominal organs feel more solid and substantial, while the muscular walls of this region are far stronger. You will have a sense of strength in this region, and this is absolutely the case in so far as the external muscles of this part of the body are concerned. But the more valuable gain will be in the strength of the organs themselves. These organs are partly muscular in character, and they are firm and strong, or soft and flaccid, in accordance with the intelligent consideration that they receive and the amount of exercise given them. Before long you should be able to use almost your entire strength in exerting pressure, and feel nothing but beneficial results. But when doing this it may be well to change the position of the hand slightly for each application of pressure, rather than to repeat such strenuous treatment so many times in one spot. The idea is to exert pressure throughout the entire region of the abdomen, chest, sides and back. It may occur to the reader that this form of exercise for the vital organs has a certain distant similarity to some features of massage treatment, known as deep massage. However, this method is much more vigorous than any form of massage, and is of a character to build a degree of real internal strength that cannot be attained through massage of any kind. And it has the advantage of being convenient for self-application. After a time you may be able to originate pressure movements of your own. One of my friends writes that he has used a similar idea associated with a vibratory motion. He slightly agitates the hand in different directions while pressing inwards. This is well worth a trial, and it partakes very much of the nature of massage. Another good practice is to inhale a deep breath and then while holding this breath apply pressure all along the central portion of the abdominal region, from the breastbone downwards, from ten to twenty times. Then, without exhaling the breath, draw in all the additional air you can and repeat the pressure movements six to twelve times, after which you may be able to take in still more air. One should be careful not to carry this holding of the breath too far. At the first signs of discomfort the breath should be exhaled quickly. CHAPTER XVI: Blood Purification If one could maintain his blood in absolute purity disease would be virtually impossible. The blood is the life. You are what you are through the influence of the blood that circulates throughout your entire body.