II.—ENS VENENI. _Diseases originating from poisonous actions and impurities_ in all three planes of existence. Nothing is poisonous or impure if it stands by itself, only if two things whose natures are incompatible with each other come into contact, can a poisonous action take place or an impure condition be produced. “Everything is in itself perfect and good. Only when it enters into relation with another thing does relative good and evil come into existence. If anything enters into the constitution of man, which is not in harmony with its elements, the one is to the other an impurity, and can become a poison.” (“Paramirum,” II. 1.) There is no doubt that modern chemistry, physiology and pathology teach more than ancient science in regard to the chemical constitution, the physiological action of poisons and of the pathological effects which they produce in the animal body; but to explain the order in which a process takes place is not sufficient to explain why it takes place, and there is still a wide field open for investigation; for at present we can only record the fact that certain physical substances have a destructive action upon the human body; while the same substances with a little difference in the arrangements of their molecules, are not only not injurious, but even used as food;[33] that certain substances have a specific action upon the emotional nature in man, causing an inclination to certain states of his astral constitution, such as irritability of temper, anger, cupidity, etc., which they could not have if no corresponding elements were contained in them; while others have a specific action upon the mind, such as the fading of memory, paralysis of the will, excitement of the imagination, all of which they could not accomplish if no substantial mind principle existed in them.