A patient of mine who had been in a wheel chair for twelve years, and afflicted for twenty years with locomotor ataxia, was so much improved within a year's time that he walked from Brooklyn to my office in New York City to exhibit himself. He gave me a testimonial letter and the privilege of using it in my advertisements. I wrote up the facts in regard to his case and submitted them to my agent, who was an expert advertiser, and he advised me not to state the facts as they were; the public, he contended, would not accept them as true. BE COURTEOUS AND TOLERANT It is almost impossible to estimate the moral effect of a broad-minded, tolerant and courteous attitude toward others engaged in the practise of the healing art. Medical doctors seldom agree, especially those of different schools. They accuse each other of ignorance and incompetence, and the public is sometimes inclined to concede that they are right. In certainty and in truth one has confidence and strength which is always conducive to tolerance. The food scientist, knowing the laws of cause and effect in regard to nutrition, and knowing the proper use of natural methods of diet and hygiene in the prevention and the cure of specific dis-eases, needs neither to dispute with a fellow practitioner, nor to argue with his patient. He can afford to state his position and quietly allow Nature to prove his claims. LESSON XIX EVOLUTION OF MAN The following lessons, while they do not treat directly of either the chemistry of food or the chemistry of the body, are so closely allied to these subjects that this work would not be complete without them. LESSON XIX EVOLUTION OF MAN WHAT IS EVOLUTION? If a resident of a city, who is not familiar with modern farm machinery, should see a grain-binder at work, he would be impressed with the skill and the ingenuity of man. In all probability he would think that the machine was the product of one inventive mind. In this, however, he would be mistaken. The reaper in its modern form is the result of gradual development or growth. [Sidenote: An example of evolution] The earliest method of gathering grain was pulling it up by the roots. Later, as cutting tools were invented, a rough knife was used to sever the stalks just above the ground. An improvement upon this method was the cycle; then came the scythe, then the cradle; and next came the mower which was operated by horse-power. From the mower was developed the self rake, which bunched the grain so that the hand-binders could work with greater facility. The next improvement was a self-binding machine. In the present machine we have all of these and many other improvements, which give greater speed with less waste of labor and time.