He is a vacuum for its pressure. The cause why he succumbed was in him long before the infector appeared. Susceptibility to a disease is. For the air is full of diseases waiting to be employed. Susceptibility in organism, mental or bodily, is equivalent to state.
State involves the attitude of organizations to internal causes and to external circumstances.
It is all the resource of defense or the way of yielding. The taking on of states is be history of human life. Pathology is the account of the taking on of diseased states, or of definite forms of disease, mental or bodily. In health we live and act and resist without knowing it. We must also predicate a state of normal susceptibility to remedial as well as toxic agencies, which it is the duty of the physician to conserve and utilize.