Throughout history philosophers have posited souls, vital spirits and other active principles in living beings in order to explain their differences from non-living beings. With the arrival of genetics and evolutionary biology, however, it now seems possible to account for these differences without assuming such principles. Living beings are henceforth to be understood mechanically, as products of self-replicating microscopic objects and selective environmental conditions, rather than pneumatically, in terms of active principles. It is very remarkable, therefore, that physics has since abandoned the mechanical model of explanation, which it gave to biology, and returned to the pneumatical model, applying it not merely to living beings but to matter quite generally. The conceptual origins and philosophical significance of this remarkable development are explored in the present work. Part One...
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