The changing role of the embryo in evolutionary thought: roots of evo-devo

Introduction

Part I. Darwin's century: beyond the essentialism story. Systematics and the birth of the natural system

The origins of morphology, the science of form

Owen and Darwin, the archetype and the ancestor

Evolutionary morphology: the first generation of evolutionists

Interlude

Part II. Neo-Darwin's century: explaining the absence and the reappearance of development in evolutionary thought. The invention of heredity

Basics of the evolutionary synthesis

Structuralist reactions to the synthesis

The synthesis matures

Recent debates and the continuing tension.