CHAPTER XXX. ON THE BENEFITS OF SUNLIGHT 255 CHAPTER XXXI. ON THE ADVANTAGES OF AN OPEN AIR LIFE AND OF 262 BREATHING EXERCISES CHAPTER XXXII. ON THE DANGERS OF LIVING IN CONFINED AND 271 ILL-VENTILATED QUARTERS CHAPTER XXXIII. HYGIENE OF ARTIFICIAL HEATING—THE DANGERS OF HEAT 275 BY STEAM AND A FEW HINTS ABOUT THEIR PREVENTION CHAPTER XXXIV. FOOD HYGIENE—GENERAL REMARKS 280 CHAPTER XXXV. ON PROTEID FOOD, ANIMAL FOOD, MEAT, FISH, EGGS, 294 MILK, ETC. CHAPTER XXXVI. ON CARBOHYDRATES AND FATS, AND THE GREAT 301 ADVANTAGES OF VEGETABLES AND FRUIT CHAPTER XXXVII. ON THE ADVANTAGES AND DISADVANTAGES OF A 309 VEGETARIAN DIET CHAPTER XXXVIII. ON THE DANGERS OF A TOO ABUNDANT MEAT DIET—A FEW 317 HINTS ON THE DIETETICS OF MEAT CHAPTER XXXIX. ON THE GREAT ADVANTAGES OF MUCH MILK IN THE DIET 325 FOR THE PREVENTION AND TREATMENT OF OLD AGE CHAPTER XL. ON BLOOD AS AN ARTICLE OF FOOD CONTAINING IRON AND 333 ANIMAL EXTRACTS—SAUSAGES AND BLOOD PUDDINGS CHAPTER XLI. SOME REMARKS ON THE HYGIENE OF EATING—HOW TO 339 OBTAIN AN APPETITE—ON MASTICATION CHAPTER XLII. ON THE USES OF SMALL DOSES, AND THE DELETERIOUS 347 ACTION OF LARGE QUANTITIES OF ALCOHOL CHAPTER XLIII. SOME REMARKS ON THE CAUSES AND PREVENTION OF THE 356 ALCOHOL HABIT CHAPTER XLIV. ON OTHER STIMULANTS—TEA, COFFEE, COCOA, TOBACCO: 362 THEIR MERITS AND DISADVANTAGES CHAPTER XLV. ON SLEEP, AND ITS IMPORTANCE IN RIDDING THE BODY 368 OF TOXIC PRODUCTS CHAPTER XLVI. ON THE CAUSATION OF SLEEP, SLEEPINESS, AND 372 INSOMNIA CHAPTER XLVII. HYGIENE OF SLEEP—PREVENTION OF INSOMNIA 377 CHAPTER XLVIII. THE TREATMENT OF SLEEPINESS AND INSOMNIA 383 CHAPTER XLIX. HYGIENE OF THE SEXUAL GLANDS—THE DANGERS OF SEXUAL 389 OVERACTIVITY AND OF TOTAL SEXUAL ABSTINENCE CHAPTER L. ON MARRIED LIFE AS AN IMPORTANT MEANS FOR 400 PROLONGING LIFE