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Physiological psychology, on the other hand, is competent to investigate the relations that hold between the processes of the physical and those of the mental life.

Physiological psychology is, therefore, first of all psychology.

Physiology is concerned with all those phenomena of life that present them selves to us in sense perception as bodily processes, and accordingly form part of that total environment which we name the external world.

The biological task of science is to provide the fully developed human individual with as perfect a means of orientating himself as possible. No other scientific ideal can be realised, and any other must be meaningless.

Physiology has spawned many biological sciences, amongst them my own field of pharmacology.

Physiology and psychology cover, between them, the field of vital phenomena; they deal with the facts of life at large, and in particular with the facts of human life.

Physiology is the science which treats of the properties of organic bodies, animal and vegetable, of the phenomena they present, and of the laws which govern their actions. Inorganic substances are the objects of other sciences, - physics and chemistry.

The investigations which have seemingly been the most purely abstract have often formed the foundation of the most important changes or improvements in the conditions of human life.

There are no clear boundary lines between what is physiological, what is psychological, and what is spiritual. Those are language domains that make sense and have integrity but overlap significantly.