Not the knife of the surgeon, not the poison of the physician of the old school, but simply harmonizing the individual life with the laws of nature, will eradicate the cause. The tremendous importance of the subject, the wide field to be covered, makes it wellnigh impossible to treat the matter within the present limits as extensively as it should be treated. A large part of my book, "Dare To Be Healthy," of which this is but an abstract, deals exhaustively with this topic. There the reader will find the most interesting details in regard to the connection between these widely divergent forms of disease. Their nature as blood-diseases carries with it the fact that they are preeminently persistent through many generations, so that today there is but a minority of human beings in whom all tendency towards them is missing. So predisposition advances with the continuity of environment, the one point at which, at least in the case of the so-called white plague, or tuberculosis, an effort against it has been made. _The development towards the eradication of these evils has been neutralised by the overwhelming importance science has given to the theory of the bacillus as the incentive element of disease, while it is only a product of the same. The serum and anti-toxin therapy, which in its fight against the bacillus, lost sight of the first task of medicine, that of fighting the disease, was the logical consequence thereof._ The blood liquid which consists of the plasma and red and white blood corpuscles, and is the carrier of the lymph to such parts of the body as are not fed directly by the lymphatic vessels, such as the nerves, must have a well defined chemical composition in order to fulfil its task. What we call deficiency of blood is, with the exception of traumatically inflicted losses, normal in quantity, to a great extent, but deficient in quality. This consists in the chemical composition and the proportion of nutritive salts in the serum, or in the relation and quality of the oxygen carriers, that is, the red and white corpuscles, whose task it is to remove foreign and disturbing elements from the blood. It is obvious that deficiency in these elements may be of infinite variety and of the most far reaching consequence for the various tissues of the body, which receive their nourishment therefrom.