So much for the usefulness of the mouth-muscles, including that most wonderful of muscles, the tongue, in assisting in the healthful stimulation of nutrition. Their most important office is to stand guard against the contingencies that are liable to happen which are prejudicial to digestion. If there is worry in the atmosphere: "Don't let anything into the mouth on pain of court-martial and suffering!" Those are the "orders of the day" for the sentinel muscles of the mouth, serving at the outer entrance of the alimentary canal. In the category of "worry" are included anger, argument, blues, or any other of the depressant passions, and no food or drink, other than water, should be admitted to the canal while any form of depressants are being suffered. We must agree in the first place that it can do no harm to wait for a clearance of the mental atmosphere. Real hunger is not a painful craving for something or anything, but is a most accommodating waiter for final collection of all the taste dividends there are due in a big lump sum to compensate for not getting them by instalments. Consequently, if the mental atmospheric conditions are not favourable to the best nutrition, the best way to clear them is to wait. Nothing is so forceful in making one modify or forget passing clouds of pain or disappointment as growing healthy Hunger. The mouth-muscles soon learn to know this beautiful provision of Mother Nature, whereby deferred collections by appetite are paid with compound interest sometimes sure, if by the waiting process the mental atmosphere is cleared of the elements of digestive lightning and thunder. How delightful it is to be assured that the best way to secure the best nutrition is the easiest way and that it can be quickly installed as a habit, so that attention to the mechanics of the care is not necessary, leaving the whole battery of appreciation to employ itself with the gustatory festival. CHAPTER XV FLETCHERISM AND VEGETARIANISM The Danger of Excess of Protein--The Use of Meat and Uric Acid--To Sum Up--Profitable Economy In the warfare against the "Demons of Dietetic Disturbances" most of the volunteer recruits go into the camp of the _Mealers_, that is, they become vegetarians, _quasi_-vegetarians, or partial vegetarians, and array themselves against human carnivorous habits and practices. They are comparatively few in numbers, but make up in enthusiasm what they lack in numerical strength. Some of them base their objection to meat-eating on physiological grounds, others on sentimental susceptibility, and yet others are influenced by reasons of economy. With world-wide and centuries-old evidence before me in forming an opinion, I say without hesitation that the weight of argument is in favour of a meatless diet most, if not all, of the time, and that all who subsist on the first-hand fruits of the soil and do not resort to cannibalism, except in cases of emergency, are on the safer side.