Abstract: DISEASE is a point of view. When one organism is living in association with another, the former at the expense of the latter, the balance of metabolism in the latter is always disturbed. The latter may be called diseased while the former is happy in having a plentiful supply of food without much exertion. In Nature such association is constantly going on. A certain system ceases to exist while another comes into being as a consequence. In calling Nature ‘healthy’ or ‘diseased’ we are projecting the human point of view into its operations. It seems to me more profitable to try to consider Nature without being influenced by human prejudices.