This evidence, confirming my own secured by concentrated and unremitting study of the effect of head digestion on health and recuperative reconstruction, is proof enough that there is an important department of nutrition that can be properly called head digestion. MY STUDY OF THE SUBJECT began with the tip from Mother Logic--that the full extent of the personal responsibility in nutrition is located in the head before the food is swallowed. That is what led me to concentrate on the mouth as the field of our responsibility which had been neglected by Science. Even the Dental Profession as a whole had not at that time "tumbled" to the fact that they were occupied professionally and constantly in a field of "Preventive Medicine" as important as now they find it. Everybody had supposed that the digestion of food was effected only in the stomach and small intestines. This may be true, in a narrow sense, but it can be arrested and completely stopped by the head. Furthermore, digestion can be as much assisted by favourable head influence as it can be obstructed by unfavourable head treatment. This being so, as everybody knows, or can easily learn, what follows as a logical sequence? Here is a physiological eye-opener, as it dawns upon the business physiologist. The obvious inference is that if the head can make digestion easy or stop it altogether, the stomach being a subservient, mechanical, and chemical servant of the head in the matter, we may properly declare that the master-key of digestion is held by the head, and we may safely say that there is Head Digestion. THE MOUTH AS A DIGESTIVE ORGAN The logical continuation of the search for the location of responsibility for good or poor digestion leads us to consider the question of "Division of Labour" as apportioned by the Laws of Normality. All the laboratory evidence I have seen confirms my own observations of the past fifteen years that Nature assures good results if we are thoroughly faithful to our head responsibility during the treatment of food up to the point of swallowing. From that time digestion has been rendered so easy by thorough mouth preparation that it may proceed smoothly even if the mental states are not pleasant. Here, too, we discover that easy digestion reacts favourably on the mentality and exerts a calming influence. Some observers declare that idiots digest their food quite easily. The less mental clarity they possess the better for their metabolism. This does not argue in favour of the absence of mental influence, for the idiot is a sensualist, and in the relief from mental excitement finds enjoyment of taste and the satisfaction of appetite as agreeable as do the animals under similar favourable conditions.