CHAPTER IX. THE RATIONAL PREVENTION OF PREMATURE OLD AGE AND 114 THE TREATMENT OF OLD AGE CHAPTER X. THE DESTRUCTION AND ELIMINATION OF TOXIC PRODUCTS 134 FROM THE BODY AND HYGIENIC MEASURES FOR THE IMPROVEMENT OF THESE FUNCTIONS CHAPTER XI. ON THE DESTRUCTION OF POISONOUS PRODUCTS THROUGH 138 THE THYROID AND PARATHYROID GLANDS CHAPTER XII. HYGIENE OF THE THYROID GLAND 145 CHAPTER XIII. THE DESTRUCTION OF TOXIC PRODUCTS BY THE LIVER AND 149 THE IMPROVEMENT OF ITS PROTECTIVE FUNCTIONS CHAPTER XIV. THE HYGIENE OF THE LIVER 155 CHAPTER XV. ON THE DESTRUCTION OF TOXIC PRODUCTS BY THE 159 ADRENALS CHAPTER XVI. HYGIENE OF THE ADRENALS AND OF THE CIRCULATORY 164 SYSTEM—A FEW REMARKS ON THE CAUSE, PREVENTION, AND TREATMENT OF ARTERIOSCLEROSIS CHAPTER XVII. THE ELIMINATION OF TOXIC PRODUCTS THROUGH THE 170 INTESTINES AND THE IMPROVEMENT OF THIS FUNCTION CHAPTER XVIII. ON THE PREVENTION AND TREATMENT OF HABITUAL 175 CONSTIPATION CHAPTER XIX. HYGIENE OF THE INTESTINES 182 CHAPTER XX. HYGIENE OF THE INTESTINES—A FEW REMARKS ON THE 192 CAUSE AND PREVENTION OF APPENDICITIS CHAPTER XXI. ON THE ELIMINATION OF TOXIC PRODUCTS THROUGH THE 197 KIDNEYS CHAPTER XXII. HYGIENE OF THE KIDNEYS, AND THE PREVENTION OF 203 RENAL DISEASE CHAPTER XXIII. ON THE ELIMINATION OF TOXIC PRODUCTS THROUGH THE 209 SKIN CHAPTER XXIV. THE HYGIENE OF THE SKIN—AIR BATHS 215 CHAPTER XXV. ON RATIONAL CLOTHING 219 CHAPTER XXVI. IMPROVED HYGIENE OF THE SKIN AND KIDNEYS THROUGH 231 BATHING—FOOT-BATHS CHAPTER XXVII. HYGIENE OF THE SKIN AND KIDNEYS BY MEANS OF 237 PERSPIRATION CHAPTER XXVIII. ON EXERCISE, SWEDISH GYMNASTICS—MASSAGE—SPORT, AND 244 WALKING AND RUNNING EXERCISE CHAPTER XXIX. A FEW REMARKS ON COLD FEET—THEIR CAUSE AND 252 TREATMENT