Similarities, Ancestors and Relatives: How Evolutionary Thought Took Shape
The idea that living organisms resemble one another is hardly new. Not all do so in the same way or for the same reasons, but there is a certain family resemblance that had already attracted attention in antiquity. Explaining the basis of these similarities with any precision, however, required several different ideas about how living organisms change over time to come together. Ideas inherited from classical antiquity about biological kinship should not, however, be regarded as evolutionary theories, since they had little continuity with modern thought. A more decisive moment came in eighteenth-century France, where a remarkable mixture of natural history, philosophy, geology, and speculation prepared the ground for nineteenth-century evolutionary theories. German Naturphilosophie also contributed indirectly. Its advocates often searched for an underlying plan behind the enormous variety of living forms. Although they did not necessarily accept evolution, their insistence...