It has been found that nitrogen equilibrium can be maintained at a wide range of levels. Formerly 135-150 gms. of protein daily were considered necessary for a man doing light work. Now it is known that half that amount is sufficient to keep one in nitrogenous equilibrium, and to enable one to keep his weight. A person at rest requires even less than that. One who is engaged in hard physical labor burns up more fuel in the muscles, and so must have a larger fuel supply. Although we habitually eat too much we drink too little water. For those who have any form of arterial disease an excess of fluid is harmful, as the vessels become filled up and a condition of plethora results, which necessarily reacts injuriously on the heart and circulation. The drinking of a glass of water during meals is, in the author's opinion, good practice. The water must be taken mouthful at a time, and not gulped down. If this is done, there results sufficient dilution of the solid food to enable the gastric juices successfully and rapidly to reach all parts of the meal. Some are in favor of a rigid milk diet for those who have arteriosclerosis. Some men have lived on nothing but milk for several years and have not only kept in good health, but have actually gained weight and led at the same time active lives. It has been held by others that rigid milk diet is positively harmful on account of the relatively large quantity of calcium salts that are ingested. This was thought to favor the deposition of calcareous material in the walls of the already diseased arteries. While possibly there may be some danger of increased calcification, the majority of clinicians are in favor of a milk cure given at intervals. Thus the patient is made to take three to four quarts daily for a period of a month. There is then a gradual return to a general diet, exclusive of meat, for several weeks, then another rigid milk diet period. If we are bold enough to follow Metschnikoff in his theories of longevity, we might advise resection of the large intestine, on the ground that it is an enormous culture tube that produces prodigious amounts of poisonous substances which are thrown into the general circulation. To combat such a grave (?) condition as the carrying of several feet of large intestine, we are recommended to take buttermilk or milk soured by means of the _b. acidus lacticus_. Clinical experience has taught that in arteriosclerosis buttermilk is of great value, whether it be the natural product, or made directly from sweet milk by the addition of the bacilli. The latter is a smoother product and has, to my mind, a delightful flavor. It may be diluted with Vichy or plain soda water. Cases that can not take milk or any other food will often take buttermilk, and do well on this restricted diet. From two to four quarts daily should be taken. It should be drunk slowly as should milk. =Medicinal=