Introduction

The groups of problems that fall under the titles ‘reduction’ and ‘emergence’ appear at the boundaries of seemingly independent and well-established scientific disciplines, such as chemistry and biology, biology and psychology, biology and political theory, and so on. They arise in this way:

1. There is a widespread intellectual ‘urge’ towards developing a common discourse for adjacent disciplinary practices such as biology and chemistry, biology and psychology, law and psychiatry. To achieve this goal a unified and coherent system of concepts would be required that would be adequate to describe and to explain the phenomena which are the subject matter of both disciplines.

2. There is a discontinuity between the concepts native to each of the adjacent disciplines in that predications from each to a common subject such as a sample of a material substance, or a process or a human being, appear to be incompatible. For example to describe a certain reaction as ‘reducing’ and to describe it in terms of the quantum states of molecular orbitals is an incompatible predication. For example to say that a brain is thinking and that that brain is taking up glucose is an incompatible predication since the criteria for these assertions are radically different. Or, to say that a human being is ill and to say that a human being is malfunctioning is an incompatible predication, since the former requires the speaker to treat the human being as a person, and the latter as an organism. Just what these various differences amount to will be the main aim of this paper.