Shepherd’s Metaphysics of Emergence

The notion of causation that Mary Shepherd develops in her 1824 An Essay Upon the Relation of Cause and Effect (ERCE) has a number of surprising features that have only recently begun to be studied by scholars. This relation is synchronic, rather than diachronic (ERCE pp. 49–50); it always involves a ‘mixture’ of pre-existing objects (ERCE pp. 46–7); and the effect must be ‘a new nature, capable of exhibiting qualities varying from those of either of the objects unconjoined’ (ERCE p. 63). In this essay, I argue for an emergentist interpretation of Shepherd’s causal theory. On the reading I defend, all effects have qualities that metaphysically emerge from the complex interactions of their constituents. This reading explains the structure of Shepherd’s causal relation and clarifies the central aims of her philosophical project. In response to the problems raised by the science of her time, Shepherd developed a theory of emergence and published it during the period when the concept was first being shaped and adopted by prominent philosophers. Her work thus merits a place in the history of emergentist ideas.