AS a further failure to cope with his problem, the "health-food" dietitian in most cases ignores the temperamental aspect of his subject. Yet Pavlow, backed up by such authorities as Prof. Gauthier of Paris and Sir William Robert of Edinburgh, have proved with scientific certainty that the secretion initiating the digestive process is fundamentally modified by the "psychic impulse" of the individual, and that the success of his digestion will depend upon the mental and moral attitude of his mind. In other words individual temperament is an all-important factor in nutrition, as there exists a positive relationship between the mental polarity of the mind of the individual and the vital polarity of his food. In our complex system of living, where artificial conditions are constantly interfering with the orderings of a constructive and biologically poised natural evolution, there is an ever increasing need to keep a close account of the mental and moral attitude of the individual in his relation to food. The true dietitian must endeavor to bring about conditions of harmonious interaction between the chemico-vital character of the food and the mental-nervous tendency of the individual, and thus make it possible to provide a physiological shock-absorber for the idiosyncrasies that govern personal sensibilities in relation to certain foodstuffs. Hence the highly strung nervous system of one individual may and does require an altogether different class of food than the lymphatic and sluggish temperament of another. And to the extent foods divide themselves in acidic and alkaline groups, with their vital synonyms expressed in electric and magnetic polarities, they should be recognized and adapted to corresponding individual temperaments. It should, furthermore, be recognized that temperaments in themselves have power to generate in their own system such secretions as express their own vital type. In other words the nervous and high-strung, by the very intensity of their mentality tend to give to their alimentary secretions the ascendency of the electric or acidic predisposition; and to give acid or acid-producing foods to men of this type of temperament would naturally result in a serious accumulation of acids in their system, and thus add to their already predominating nervousness. On the same principle it would be very unscientific to treat the opposite type of mind - the lymphatic and sluggish - to a diet made up of alkaline foods, as these foods would tend to slow down the vital currents of this type of temperament to the very point of stagnation. Thus an almost unlimited fruit diet, which might prove quite beneficial as a needful stimulation to the sluggish and lymphatic individual, would in most cases become disastrous to high strung and nervous natures. What is food for one may thus prove poison to another.