The Structure of Evolutionary Theory

1 - 3. The famous frontispiece from Scilla's treatise of 1670 defending the organic nature of
fossils. The solid young man, representing the truth of sensory experience, shows a fossil
sea urchin in his right hand to a wraithlike figure representing the former style of
speculative thinking. With his left hand, the solid figure points to other fossils found in
Sicily. The text proclaims: "Vain speculation undeceived by the senses."
18 THE STRUCTURE OF EVOLUTIONARY THEORY