Since the discovery of the bacillus or microbe, which in varied form accompanies nearly every variety of disease, it has become a dogma of the at present dominant school of medicine that the various bacilli are the actual causes of the different varieties of disease, and the tendency has been to find some poison that would kill the bacilli in order to heal the disease. The truth is that the bacillus is not the cause, but the effect of disease; in fact is nothing but another consequence or symptom of a specific form of disease. Bacilli grow spontaneously in the ready soil which the diseased and decomposing tissues provide, through lack of the necessary chemical elements; but to attempt to exterminate them, while the underlying conditions for their reproduction remain unchanged, can, of course, never bring about healing. And thus the high hopes and claims attached to the sero-therapy inocculation process, the injection into the blood of anti-toxins prepared with the serum of animals, have positively vanished. Hundreds of thousands of human beings have perished in the course of this delusion; but countless numbers will have cause, yet in our day, to rejoice at the exposure of the stupid and unnatural theory, so long legally enforced, that the introduction into the human system of such poisonous substances could remove or overcome the natural consequences of constitutional disease. HEREDITY. The discovery that a diseased condition of the blood leads to certain bodily disturbances which we call disease, was soon followed by the realization of the fact that one of the main conditions which bring about such disturbances is predisposition, which in many cases is hereditary. "Hereditary disease" simply means that the improper chemical composition of the blood of one or both parents has become duplicated in the offspring, and that it has similar consequences in causing the degeneration of certain tissues, and consequently of the organs composed thereof, as may have been the case in the parents. It is at least reassuring to know, however, _that to the modern hygienic-dietetic system of healing, heredity, though perhaps more tenacious, is by no means an invincible enemy_. With a predisposition to disease the child acquires also the hereditary tendency to self-protection, and thus rational hygienic-dietetic treatment may be able to eliminate, in a comparatively short time, the chain of diseases which in former years, generations have carried hopelessly to the grave. HEALING. It has been already stated that healing, under the modern hygienic-dietetic system, means supplying to the blood such chemical elements as will replace what are missing in defective tissues of the body. I will now outline the methods of carrying it into effect. In a general way there are three means of doing this: No. 1. _Diet_: The first and most natural way is by proper diet.