In order to establish more unmistakably the symptomatic sympathetic connection between the Vagus and Influenza, it may be well to touch briefly upon the initial processes of metabolism and nerve production. An inherent impulse in the ovum (protoplasm or egg cell) serves to separate the albuminous substance into groups of an opposite nature. Water is chemically separated from one portion, which results in thickening the albumen from which it was extracted, while the liberated water aids in liquifying another portion of the albuminous matter. Thus, on one side slender threads arise, termed fibrine or filaments, and on the other lymph fluid appears, which receives the particles of salts freed from the filaments during their chemical separation. When the fibrine and lymph are organized from the protoplasm, the remaining albumen is absolutely unchanged and ready to furnish material for the growth of either. It is the function of salts to increase the electrical tension of the lymph. All salts possess the property of being electrically positive or negative. The more concentrated a saline solution, the greater its electrical energy. That the function of the lymph is to assist in the formation and nutrition of the nerves is apparent when the nature of lymph and the composition of nerve substances are compared. The contrast which exists between fibrine and lymph, and the similarity of lymph to nerve fat when taken together, justify the conclusion that the nerve substance lecithin, was formed from lymph in the first instance. The whole process of life consists of an electro-chemical combustion. This is clearly shown in the case of lecithin, which serves to control both motion and sensation. In the presence of oxygen it burns up, forming a new chemical combination, and throwing off minute quantities of carbonic acid and water in the process. _Every movement and process, both voluntary and involuntary, and every thought and emotion, depends upon oxidation, which consumes muscular tissue and nerve substance._ The greater our physical exertion the more muscular tissue must be consumed. The higher our emotional state, the more we think or agitate ourselves, the greater must be the quantity of nerve substance burned up. All of the substance burned up in labour, in worry and in thought, must be replaced or the flame will flicker out! The metabolism of muscular tissue is not in question at the moment. We are concerned here with nerve metabolism alone.