The fact, that it is so difficult to realize, has led to the greatest errors in present day medical science. It seemed at first sight, so obviously necessary to study the different organs as entirely different groups, to work out a careful system of bones, of intestinal organs, of blood-vessels, of nerves, and so on; all of which is of course very valuable, in its place, but only from a descriptive standpoint. Anatomy shows us what life has produced in the construction of a human form, but it does not indicate the source of life, nor, consequently, the source of health. It is well to know the different forms of cell accumulations, which are called organs, but if we desire to keep them in good order, we must watch closely what is common to them all; for it is only from this point of view, that we are able to determine the necessary, and possibly, the lacking elements for purposes of healing. Thus, as one of the greatest achievements of modern science, we come to the one most vital thing, so sorely needed and yet so badly neglected throughout the centuries: _The chemical analysis of the human body and its different organs._ A new light has now dawned upon the subject most essential to the inauguration of a new and effective system of healing. The physiological chemist has at length discovered that the human body, and every organ of that body consists of a certain number of chemical elements, which appear in different parts in different aggregations. These aggregations, however, repeat themselves in the various parts or organs. It was thus finally discovered that there are _twelve different main aggregations of such elements_, which groups of equal elements we call _tissues_. Through this discovery we have arrived at the great truth that _it is not to the purpose, in healing, to turn attention to the various organs, but rather to the various tissues_. The influence which can be exercised on these tissues is exercised through the blood which nourishes all of them alike, and which has the wonderful capacity of carrying to each of them their necessary building and rebuilding, or regenerating materials,--_provided, of course, that these are, as they should be, present in the blood_. THE CONSTITUENT ELEMENTS. Research in physiological chemistry, has so far determined that there are sixteen definite and discernible elements--and a seventeenth is now in course of determination--which, in their various combinations and aggregations, form the different tissues of which the various organs of the human body are constructed. The preponderance of one or more of these elements in a certain tissue forms the main or governing feature, or tissue of any organ. Thus the prevalence of potassium phosphate forms the muscle tissue, the prevalence of ammonium phosphate (lecithin) forms the nerve tissue.